v3.25.4
Schedule III - Real Estate and Accumulated Depreciation - Schedule of Real Estate and Accumulated Depreciation (Details)
$ in Thousands
Dec. 31, 2025
USD ($)
ft²
property
development_project
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances $ 600,442      
Initial cost, land and improvements 2,338,175      
Initial cost, buildings and Improvements 3,163,966      
Costs Capitalized Subsequent  to Acquisition/ Improvement 7,033,000      
Land and improvements, gross 2,429,553      
Buildings and improvements, gross 10,105,588      
Land and improvements and buildings and improvements, gross 12,535,141      
Accumulated Depreciation $ 2,843,811 $ 2,824,616 $ 2,518,304 $ 2,218,710
Rentable square feet (unaudited) | ft² 16,292,164      
Unamortized deferred financing costs $ (9,150) (12,692)    
Kilroy Realty L.P.        
Real Estate and Accumulated Depreciation [Line Items]        
Long-term debt, gross 4,625,442      
Kilroy Realty L.P. | Secured debt        
Real Estate and Accumulated Depreciation [Line Items]        
Unamortized deferred financing costs (7,757) (8,489)    
3.57% Mortgage Payable due December 2026 | Kilroy Realty L.P.        
Real Estate and Accumulated Depreciation [Line Items]        
Long-term debt, gross 148,800      
3.57% Mortgage Payable due December 2026 | Kilroy Realty L.P. | Secured debt        
Real Estate and Accumulated Depreciation [Line Items]        
Long-term debt, gross 148,815 152,668    
5.90% Mortgage Payable due August 2034 | Kilroy Realty L.P.        
Real Estate and Accumulated Depreciation [Line Items]        
Long-term debt, gross 375,000      
5.90% Mortgage Payable due August 2034 | Kilroy Realty L.P. | Secured debt        
Real Estate and Accumulated Depreciation [Line Items]        
Long-term debt, gross 375,000 375,000    
4.48% Mortgage Payable due July 2027 | Kilroy Realty L.P. | Secured debt        
Real Estate and Accumulated Depreciation [Line Items]        
Long-term debt, gross $ 76,627 $ 79,020    
Building        
Real Estate and Accumulated Depreciation [Line Items]        
Depreciation life 35 years      
Tenant Improvements | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Property, plant and equipment, useful life 1 year      
Tenant Improvements | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Property, plant and equipment, useful life 20 years      
In-process development project - tenant improvement        
Real Estate and Accumulated Depreciation [Line Items]        
Rentable square feet (unaudited) | ft² 871,738      
Number of buildings | development_project 1      
345 N. Maple Drive, Beverly Hills, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 28,986      
Initial cost, buildings and Improvements 154,148      
Costs Capitalized Subsequent  to Acquisition/ Improvement 305      
Land and improvements, gross 28,986      
Buildings and improvements, gross 154,453      
Land and improvements and buildings and improvements, gross 183,439      
Accumulated Depreciation $ 2,356      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 306,366      
3101 - 3243 S. La Cienega Blvd., Culver City, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 150,718      
Initial cost, buildings and Improvements 31,033      
Costs Capitalized Subsequent  to Acquisition/ Improvement 8,524      
Land and improvements, gross 150,718      
Buildings and improvements, gross 39,557      
Land and improvements and buildings and improvements, gross 190,275      
Accumulated Depreciation $ 29,276      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 166,207      
2240 E. Imperial Highway, El Segundo, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,044      
Initial cost, buildings and Improvements 11,763      
Costs Capitalized Subsequent  to Acquisition/ Improvement 30,740      
Land and improvements, gross 1,048      
Buildings and improvements, gross 42,499      
Land and improvements and buildings and improvements, gross 43,547      
Accumulated Depreciation $ 33,616      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 122,870      
2250 E. Imperial Highway, El Segundo, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 2,579      
Initial cost, buildings and Improvements 29,062      
Costs Capitalized Subsequent  to Acquisition/ Improvement 38,157      
Land and improvements, gross 2,547      
Buildings and improvements, gross 67,251      
Land and improvements and buildings and improvements, gross 69,798      
Accumulated Depreciation $ 63,889      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 298,728      
2260 E. Imperial Highway, El Segundo, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 2,518      
Initial cost, buildings and Improvements 28,370      
Costs Capitalized Subsequent  to Acquisition/ Improvement 38,003      
Land and improvements, gross 2,547      
Buildings and improvements, gross 66,344      
Land and improvements and buildings and improvements, gross 68,891      
Accumulated Depreciation $ 29,746      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 298,728      
909 N. Pacific Coast Highway, El Segundo, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 3,577      
Initial cost, buildings and Improvements 34,042      
Costs Capitalized Subsequent  to Acquisition/ Improvement 60,611      
Land and improvements, gross 3,565      
Buildings and improvements, gross 94,665      
Land and improvements and buildings and improvements, gross 98,230      
Accumulated Depreciation $ 61,673      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 244,880      
999 N. Pacific Coast Highway, El Segundo, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,407      
Initial cost, buildings and Improvements 34,326      
Costs Capitalized Subsequent  to Acquisition/ Improvement 19,308      
Land and improvements, gross 1,407      
Buildings and improvements, gross 53,634      
Land and improvements and buildings and improvements, gross 55,041      
Accumulated Depreciation $ 37,781      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 138,389      
3750 Kilroy Airport Way, Long Beach, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 1,941      
Costs Capitalized Subsequent  to Acquisition/ Improvement 13,718      
Land and improvements, gross 0      
Buildings and improvements, gross 15,659      
Land and improvements and buildings and improvements, gross 15,659      
Accumulated Depreciation $ 13,660      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 10,718      
3760 Kilroy Airport Way, Long Beach, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 17,467      
Costs Capitalized Subsequent  to Acquisition/ Improvement 24,161      
Land and improvements, gross 0      
Buildings and improvements, gross 41,628      
Land and improvements and buildings and improvements, gross 41,628      
Accumulated Depreciation $ 35,657      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 166,761      
3780 Kilroy Airport Way, Long Beach, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 22,319      
Costs Capitalized Subsequent  to Acquisition/ Improvement 41,190      
Land and improvements, gross 0      
Buildings and improvements, gross 63,509      
Land and improvements and buildings and improvements, gross 63,509      
Accumulated Depreciation $ 53,312      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 221,452      
3800 Kilroy Airport Way, Long Beach, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 19,408      
Costs Capitalized Subsequent  to Acquisition/ Improvement 25,856      
Land and improvements, gross 0      
Buildings and improvements, gross 45,264      
Land and improvements and buildings and improvements, gross 45,264      
Accumulated Depreciation $ 35,231      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 192,476      
3840 Kilroy Airport Way, Long Beach, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 13,586      
Costs Capitalized Subsequent  to Acquisition/ Improvement 33,409      
Land and improvements, gross 0      
Buildings and improvements, gross 46,995      
Land and improvements and buildings and improvements, gross 46,995      
Accumulated Depreciation $ 25,243      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 138,441      
3880 Kilroy Airport Way, Long Beach, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 9,704      
Costs Capitalized Subsequent  to Acquisition/ Improvement 18,398      
Land and improvements, gross 0      
Buildings and improvements, gross 28,102      
Land and improvements and buildings and improvements, gross 28,102      
Accumulated Depreciation $ 8,721      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 96,922      
3900 Kilroy Airport Way, Long Beach, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 12,615      
Costs Capitalized Subsequent  to Acquisition/ Improvement 23,741      
Land and improvements, gross 0      
Buildings and improvements, gross 36,356      
Land and improvements and buildings and improvements, gross 36,356      
Accumulated Depreciation $ 24,566      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 130,935      
1350 Ivar Ave., Los Angeles, CA (5)        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,575      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 14,276      
Land and improvements, gross 1,575      
Buildings and improvements, gross 14,276      
Land and improvements and buildings and improvements, gross 15,851      
Accumulated Depreciation $ 2,104      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 16,448      
1355 Vine St., Los Angeles, CA (5)        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 17,588      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 120,294      
Land and improvements, gross 17,588      
Buildings and improvements, gross 120,294      
Land and improvements and buildings and improvements, gross 137,882      
Accumulated Depreciation $ 18,232      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 183,129      
1375 Vine St., Los Angeles, CA (5)        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 15,578      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 103,368      
Land and improvements, gross 15,578      
Buildings and improvements, gross 103,368      
Land and improvements and buildings and improvements, gross 118,946      
Accumulated Depreciation $ 15,626      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 159,236      
1395 Vine St., Los Angeles, CA (5)        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 278      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 3,261      
Land and improvements, gross 278      
Buildings and improvements, gross 3,261      
Land and improvements and buildings and improvements, gross 3,539      
Accumulated Depreciation $ 481      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 2,575      
1500 N. El Centro Ave., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 9,235      
Initial cost, buildings and Improvements 21      
Costs Capitalized Subsequent  to Acquisition/ Improvement 64,156      
Land and improvements, gross 9,235      
Buildings and improvements, gross 64,177      
Land and improvements and buildings and improvements, gross 73,412      
Accumulated Depreciation $ 21,890      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 113,447      
1525 N. Gower St., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,318      
Initial cost, buildings and Improvements 3      
Costs Capitalized Subsequent  to Acquisition/ Improvement 9,774      
Land and improvements, gross 1,318      
Buildings and improvements, gross 9,777      
Land and improvements and buildings and improvements, gross 11,095      
Accumulated Depreciation $ 3,374      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 9,610      
1575 N. Gower St., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 22,153      
Initial cost, buildings and Improvements 51      
Costs Capitalized Subsequent  to Acquisition/ Improvement 120,294      
Land and improvements, gross 22,153      
Buildings and improvements, gross 120,345      
Land and improvements and buildings and improvements, gross 142,498      
Accumulated Depreciation $ 33,933      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 264,430      
6115 W. Sunset Blvd., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,313      
Initial cost, buildings and Improvements 3      
Costs Capitalized Subsequent  to Acquisition/ Improvement 17,259      
Land and improvements, gross 2,455      
Buildings and improvements, gross 16,120      
Land and improvements and buildings and improvements, gross 18,575      
Accumulated Depreciation $ 6,235      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 26,238      
6121 W. Sunset Blvd., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 11,120      
Initial cost, buildings and Improvements 4,256      
Costs Capitalized Subsequent  to Acquisition/ Improvement 42,373      
Land and improvements, gross 8,703      
Buildings and improvements, gross 49,046      
Land and improvements and buildings and improvements, gross 57,749      
Accumulated Depreciation $ 14,678      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 93,418      
8560 W. Sunset Blvd., West Hollywood, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 9,720      
Initial cost, buildings and Improvements 50,956      
Costs Capitalized Subsequent  to Acquisition/ Improvement 8,435      
Land and improvements, gross 9,720      
Buildings and improvements, gross 59,391      
Land and improvements and buildings and improvements, gross 69,111      
Accumulated Depreciation $ 19,995      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 76,359      
8570 W. Sunset Blvd., West Hollywood, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 31,693      
Initial cost, buildings and Improvements 27,974      
Costs Capitalized Subsequent  to Acquisition/ Improvement 7,277      
Land and improvements, gross 31,693      
Buildings and improvements, gross 35,251      
Land and improvements and buildings and improvements, gross 66,944      
Accumulated Depreciation $ 12,137      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 49,276      
8580 W. Sunset Blvd., West Hollywood, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 10,013      
Initial cost, buildings and Improvements 3,695      
Costs Capitalized Subsequent  to Acquisition/ Improvement 1,844      
Land and improvements, gross 10,013      
Buildings and improvements, gross 5,539      
Land and improvements and buildings and improvements, gross 15,552      
Accumulated Depreciation $ 2,047      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 6,875      
8590 W. Sunset Blvd., West Hollywood, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 39,954      
Initial cost, buildings and Improvements 27,884      
Costs Capitalized Subsequent  to Acquisition/ Improvement 6,157      
Land and improvements, gross 39,954      
Buildings and improvements, gross 34,041      
Land and improvements and buildings and improvements, gross 73,995      
Accumulated Depreciation $ 11,092      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 56,750      
12100 W. Olympic Blvd., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 352      
Initial cost, buildings and Improvements 45,611      
Costs Capitalized Subsequent  to Acquisition/ Improvement 30,156      
Land and improvements, gross 9,633      
Buildings and improvements, gross 66,486      
Land and improvements and buildings and improvements, gross 76,119      
Accumulated Depreciation $ 41,670      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 155,679      
12200 W. Olympic Blvd., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,329      
Initial cost, buildings and Improvements 35,488      
Costs Capitalized Subsequent  to Acquisition/ Improvement 32,085      
Land and improvements, gross 3,977      
Buildings and improvements, gross 67,925      
Land and improvements and buildings and improvements, gross 71,902      
Accumulated Depreciation $ 52,690      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 154,544      
12233 W. Olympic Blvd., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 22,100      
Initial cost, buildings and Improvements 53,170      
Costs Capitalized Subsequent  to Acquisition/ Improvement 7,147      
Land and improvements, gross 22,100      
Buildings and improvements, gross 60,317      
Land and improvements and buildings and improvements, gross 82,417      
Accumulated Depreciation $ 25,998      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 156,746      
12312 W. Olympic Blvd., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 3,325      
Initial cost, buildings and Improvements 12,202      
Costs Capitalized Subsequent  to Acquisition/ Improvement 12,741      
Land and improvements, gross 3,399      
Buildings and improvements, gross 24,869      
Land and improvements and buildings and improvements, gross 28,268      
Accumulated Depreciation $ 21,516      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 78,900      
2100/2110 Colorado Ave., Santa Monica, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 5,474      
Initial cost, buildings and Improvements 26,087      
Costs Capitalized Subsequent  to Acquisition/ Improvement 21,796      
Land and improvements, gross 5,476      
Buildings and improvements, gross 47,881      
Land and improvements and buildings and improvements, gross 53,357      
Accumulated Depreciation $ 35,412      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 104,853      
12225 El Camino Real, San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,700      
Initial cost, buildings and Improvements 9,633      
Costs Capitalized Subsequent  to Acquisition/ Improvement 4,890      
Land and improvements, gross 1,673      
Buildings and improvements, gross 14,550      
Land and improvements and buildings and improvements, gross 16,223      
Accumulated Depreciation $ 11,750      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 58,401      
12235 El Camino Real, San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,507      
Initial cost, buildings and Improvements 8,543      
Costs Capitalized Subsequent  to Acquisition/ Improvement 10,461      
Land and improvements, gross 1,540      
Buildings and improvements, gross 18,971      
Land and improvements and buildings and improvements, gross 20,511      
Accumulated Depreciation $ 15,572      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 53,751      
El Camino Real, San Diego, California Three        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,201      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 40,640      
Land and improvements, gross 4,201      
Buildings and improvements, gross 40,640      
Land and improvements and buildings and improvements, gross 44,841      
Accumulated Depreciation $ 6,474      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 110,950      
El Camino Real, San Diego, California Four        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 3,453      
Initial cost, buildings and Improvements 11,981      
Costs Capitalized Subsequent  to Acquisition/ Improvement 12,910      
Land and improvements, gross 3,453      
Buildings and improvements, gross 24,891      
Land and improvements and buildings and improvements, gross 28,344      
Accumulated Depreciation $ 16,959      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 73,238      
El Camino Real, San Diego, California Five        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 9,360      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 37,329      
Land and improvements, gross 9,360      
Buildings and improvements, gross 37,329      
Land and improvements and buildings and improvements, gross 46,689      
Accumulated Depreciation $ 10,747      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 75,035      
El Camino Real, San Diego, California Six        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 18,398      
Initial cost, buildings and Improvements 54,954      
Costs Capitalized Subsequent  to Acquisition/ Improvement 24,329      
Land and improvements, gross 18,398      
Buildings and improvements, gross 79,283      
Land and improvements and buildings and improvements, gross 97,681      
Accumulated Depreciation $ 35,624      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 140,591      
El Camino Real, San Diego, California Seven        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 10,252      
Initial cost, buildings and Improvements 21,236      
Costs Capitalized Subsequent  to Acquisition/ Improvement 17,163      
Land and improvements, gross 10,252      
Buildings and improvements, gross 38,399      
Land and improvements and buildings and improvements, gross 48,651      
Accumulated Depreciation $ 16,560      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 87,944      
El Camino Real, San Diego, California Eight        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 28,645      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 113,232      
Land and improvements, gross 28,645      
Buildings and improvements, gross 113,232      
Land and improvements and buildings and improvements, gross 141,877      
Accumulated Depreciation $ 20,696      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 196,444      
El Camino Real, San Diego, California Nine        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 11,326      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 53,257      
Land and improvements, gross 11,326      
Buildings and improvements, gross 53,257      
Land and improvements and buildings and improvements, gross 64,583      
Accumulated Depreciation $ 9,658      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 92,042      
High Bluff Drive, San Diego, California One        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,629      
Initial cost, buildings and Improvements 3,096      
Costs Capitalized Subsequent  to Acquisition/ Improvement 10,270      
Land and improvements, gross 1,629      
Buildings and improvements, gross 13,366      
Land and improvements and buildings and improvements, gross 14,995      
Accumulated Depreciation $ 10,115      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 39,192      
High Bluff Drive, San Diego, California Two        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 15,167      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 50,063      
Land and improvements, gross 15,167      
Buildings and improvements, gross 50,063      
Land and improvements and buildings and improvements, gross 65,230      
Accumulated Depreciation $ 14,629      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 216,518      
High Bluff Drive, San Diego, California Three        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 3,013      
Initial cost, buildings and Improvements 8,032      
Costs Capitalized Subsequent  to Acquisition/ Improvement 1,400      
Land and improvements, gross 3,013      
Buildings and improvements, gross 9,432      
Land and improvements and buildings and improvements, gross 12,445      
Accumulated Depreciation $ 775      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 59,245      
High Bluff Drive, San Diego, California Four        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 3,013      
Initial cost, buildings and Improvements 6,134      
Costs Capitalized Subsequent  to Acquisition/ Improvement 782      
Land and improvements, gross 3,013      
Buildings and improvements, gross 6,916      
Land and improvements and buildings and improvements, gross 9,929      
Accumulated Depreciation $ 573      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 44,486      
Valley Centre Drive, San Diego, California One        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 2,167      
Initial cost, buildings and Improvements 6,897      
Costs Capitalized Subsequent  to Acquisition/ Improvement 11,977      
Land and improvements, gross 2,858      
Buildings and improvements, gross 18,183      
Land and improvements and buildings and improvements, gross 21,041      
Accumulated Depreciation $ 13,286      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 54,960      
Valley Centre Drive, San Diego, California Two        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,184      
Initial cost, buildings and Improvements 19,352      
Costs Capitalized Subsequent  to Acquisition/ Improvement 29,823      
Land and improvements, gross 5,259      
Buildings and improvements, gross 48,100      
Land and improvements and buildings and improvements, gross 53,359      
Accumulated Depreciation $ 37,365      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 132,425      
Valley Centre Drive, San Diego, California Three        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,038      
Initial cost, buildings and Improvements 21,144      
Costs Capitalized Subsequent  to Acquisition/ Improvement 21,366      
Land and improvements, gross 4,725      
Buildings and improvements, gross 41,823      
Land and improvements and buildings and improvements, gross 46,548      
Accumulated Depreciation $ 33,190      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 124,756      
Valley Centre Drive, San Diego, California Four        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,297      
Initial cost, buildings and Improvements 18,967      
Costs Capitalized Subsequent  to Acquisition/ Improvement 19,934      
Land and improvements, gross 4,254      
Buildings and improvements, gross 38,944      
Land and improvements and buildings and improvements, gross 43,198      
Accumulated Depreciation $ 25,998      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 117,777      
Valley Centre Drive, San Diego, California Five        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 3,452      
Initial cost, buildings and Improvements 16,152      
Costs Capitalized Subsequent  to Acquisition/ Improvement 22,042      
Land and improvements, gross 4,457      
Buildings and improvements, gross 37,189      
Land and improvements and buildings and improvements, gross 41,646      
Accumulated Depreciation $ 29,027      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 118,912      
Paseo Place, San Diego, CA (Retail)        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 24,358      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 76,879      
Land and improvements, gross 24,358      
Buildings and improvements, gross 76,879      
Land and improvements and buildings and improvements, gross 101,237      
Accumulated Depreciation $ 16,296      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 95,871      
2100 Kettner Blvd., San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 19,861      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 113,891      
Land and improvements, gross 19,861      
Buildings and improvements, gross 113,891      
Land and improvements and buildings and improvements, gross 133,752      
Accumulated Depreciation $ 10,557      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 212,915      
2305 Historic Decatur Rd., San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 5,240      
Initial cost, buildings and Improvements 22,220      
Costs Capitalized Subsequent  to Acquisition/ Improvement 12,114      
Land and improvements, gross 5,240      
Buildings and improvements, gross 34,334      
Land and improvements and buildings and improvements, gross 39,574      
Accumulated Depreciation $ 19,661      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 107,456      
John Hopkins Ct., San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,225      
Initial cost, buildings and Improvements 31,258      
Costs Capitalized Subsequent  to Acquisition/ Improvement 332      
Land and improvements, gross 4,262      
Buildings and improvements, gross 31,553      
Land and improvements and buildings and improvements, gross 35,815      
Accumulated Depreciation $ 190      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 45,589      
John Hopkins Ct., San Diego, CA one        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 5,598      
Initial cost, buildings and Improvements 33,443      
Costs Capitalized Subsequent  to Acquisition/ Improvement 347      
Land and improvements, gross 5,647      
Buildings and improvements, gross 33,741      
Land and improvements and buildings and improvements, gross 39,388      
Accumulated Depreciation $ 112      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 62,739      
3535 General Atomics Ct., San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 7,433      
Initial cost, buildings and Improvements 43,774      
Costs Capitalized Subsequent  to Acquisition/ Improvement 465      
Land and improvements, gross 7,499      
Buildings and improvements, gross 44,173      
Land and improvements and buildings and improvements, gross 51,672      
Accumulated Depreciation $ 193      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 80,543      
3535 General Atomics Ct., San Diego, CA One        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,057      
Initial cost, buildings and Improvements 24,355      
Costs Capitalized Subsequent  to Acquisition/ Improvement 253      
Land and improvements, gross 4,093      
Buildings and improvements, gross 24,572      
Land and improvements and buildings and improvements, gross 28,665      
Accumulated Depreciation $ 84      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 43,295      
4690 Executive Dr., San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,623      
Initial cost, buildings and Improvements 19,686      
Costs Capitalized Subsequent  to Acquisition/ Improvement 1,368      
Land and improvements, gross 1,624      
Buildings and improvements, gross 21,053      
Land and improvements and buildings and improvements, gross 22,677      
Accumulated Depreciation $ 1,447      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 52,074      
9455 Towne Centre Dr., San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 6,081      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 79,595      
Land and improvements, gross 6,081      
Buildings and improvements, gross 79,595      
Land and improvements and buildings and improvements, gross 85,676      
Accumulated Depreciation $ 12,233      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 160,444      
9514 Towne Centre Dr., San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,928      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 47,756      
Land and improvements, gross 4,928      
Buildings and improvements, gross 47,756      
Land and improvements and buildings and improvements, gross 52,684      
Accumulated Depreciation $ 3,451      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 70,616      
4100 Bohannon Dr., Menlo Park, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,835      
Initial cost, buildings and Improvements 15,526      
Costs Capitalized Subsequent  to Acquisition/ Improvement 1,525      
Land and improvements, gross 4,860      
Buildings and improvements, gross 17,026      
Land and improvements and buildings and improvements, gross 21,886      
Accumulated Depreciation $ 7,743      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 47,643      
4200 Bohannon Dr., Menlo Park, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,798      
Initial cost, buildings and Improvements 15,406      
Costs Capitalized Subsequent  to Acquisition/ Improvement 8,414      
Land and improvements, gross 4,662      
Buildings and improvements, gross 23,956      
Land and improvements and buildings and improvements, gross 28,618      
Accumulated Depreciation $ 11,723      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 43,600      
4300 Bohannon Dr., Menlo Park, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 6,527      
Initial cost, buildings and Improvements 20,958      
Costs Capitalized Subsequent  to Acquisition/ Improvement 8,047      
Land and improvements, gross 6,470      
Buildings and improvements, gross 29,062      
Land and improvements and buildings and improvements, gross 35,532      
Accumulated Depreciation $ 14,265      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 63,430      
4400 Bohannon Dr., Menlo Park, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,939      
Initial cost, buildings and Improvements 43,213      
Costs Capitalized Subsequent  to Acquisition/ Improvement 3,115      
Land and improvements, gross 4,939      
Buildings and improvements, gross 46,328      
Land and improvements and buildings and improvements, gross 51,267      
Accumulated Depreciation $ 2,589      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 48,414      
4500 Bohannon Dr., Menlo Park, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 6,527      
Initial cost, buildings and Improvements 20,957      
Costs Capitalized Subsequent  to Acquisition/ Improvement 6,035      
Land and improvements, gross 6,470      
Buildings and improvements, gross 27,049      
Land and improvements and buildings and improvements, gross 33,519      
Accumulated Depreciation $ 12,920      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 63,429      
4600 Bohannon Dr., Menlo Park, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,798      
Initial cost, buildings and Improvements 15,406      
Costs Capitalized Subsequent  to Acquisition/ Improvement 5,424      
Land and improvements, gross 4,939      
Buildings and improvements, gross 20,689      
Land and improvements and buildings and improvements, gross 25,628      
Accumulated Depreciation $ 10,692      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 48,413      
4700 Bohannon Dr., Menlo Park, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 6,527      
Initial cost, buildings and Improvements 20,958      
Costs Capitalized Subsequent  to Acquisition/ Improvement 1,576      
Land and improvements, gross 6,470      
Buildings and improvements, gross 22,591      
Land and improvements and buildings and improvements, gross 29,061      
Accumulated Depreciation $ 10,384      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 63,429      
1290 - 1300 Terra Bella Ave., Mountain View, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 28,730      
Initial cost, buildings and Improvements 27,555      
Costs Capitalized Subsequent  to Acquisition/ Improvement 13,522      
Land and improvements, gross 28,730      
Buildings and improvements, gross 41,077      
Land and improvements and buildings and improvements, gross 69,807      
Accumulated Depreciation $ 13,628      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 114,175      
680 E. Middlefield Rd., Mountain View, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 34,755      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 56,759      
Land and improvements, gross 34,755      
Buildings and improvements, gross 56,759      
Land and improvements and buildings and improvements, gross 91,514      
Accumulated Depreciation $ 21,383      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 171,676      
690 E. Middlefield Rd., Mountain View, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 34,605      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 56,515      
Land and improvements, gross 34,605      
Buildings and improvements, gross 56,515      
Land and improvements and buildings and improvements, gross 91,120      
Accumulated Depreciation $ 21,291      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 171,215      
1701 Page Mill Rd., Palo Alto, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 99,522      
Costs Capitalized Subsequent  to Acquisition/ Improvement 117      
Land and improvements, gross 0      
Buildings and improvements, gross 99,639      
Land and improvements and buildings and improvements, gross 99,639      
Accumulated Depreciation $ 27,030      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 128,688      
3150 Porter Dr., Palo Alto, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 21,715      
Costs Capitalized Subsequent  to Acquisition/ Improvement 6,446      
Land and improvements, gross 0      
Buildings and improvements, gross 28,161      
Land and improvements and buildings and improvements, gross 28,161      
Accumulated Depreciation $ 8,888      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 36,886      
900 Jefferson Ave., Redwood City, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 16,668      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 109,784      
Land and improvements, gross 18,063      
Buildings and improvements, gross 108,389      
Land and improvements and buildings and improvements, gross 126,452      
Accumulated Depreciation $ 38,994      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 228,226      
900 Middlefield Rd., Redwood City, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 7,959      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 64,979      
Land and improvements, gross 8,626      
Buildings and improvements, gross 64,312      
Land and improvements and buildings and improvements, gross 72,938      
Accumulated Depreciation $ 19,269      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 119,616      
100 First St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 49,150      
Initial cost, buildings and Improvements 131,238      
Costs Capitalized Subsequent  to Acquisition/ Improvement 86,415      
Land and improvements, gross 49,150      
Buildings and improvements, gross 217,653      
Land and improvements and buildings and improvements, gross 266,803      
Accumulated Depreciation $ 125,428      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 480,457      
100 Hooper St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 78,564      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 197,034      
Land and improvements, gross 85,510      
Buildings and improvements, gross 190,088      
Land and improvements and buildings and improvements, gross 275,598      
Accumulated Depreciation $ 41,819      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 417,914      
201 Third St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 19,260      
Initial cost, buildings and Improvements 84,018      
Costs Capitalized Subsequent  to Acquisition/ Improvement 85,856      
Land and improvements, gross 19,260      
Buildings and improvements, gross 169,874      
Land and improvements and buildings and improvements, gross 189,134      
Accumulated Depreciation $ 109,440      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 355,960      
360 Third St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 88,235      
Costs Capitalized Subsequent  to Acquisition/ Improvement 128,912      
Land and improvements, gross 28,504      
Buildings and improvements, gross 188,643      
Land and improvements and buildings and improvements, gross 217,147      
Accumulated Depreciation $ 87,745      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 436,357      
250 Brannan St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 7,630      
Initial cost, buildings and Improvements 22,770      
Costs Capitalized Subsequent  to Acquisition/ Improvement 10,797      
Land and improvements, gross 7,630      
Buildings and improvements, gross 33,567      
Land and improvements and buildings and improvements, gross 41,197      
Accumulated Depreciation $ 17,628      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 100,850      
301 Brannan St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 5,910      
Initial cost, buildings and Improvements 22,450      
Costs Capitalized Subsequent  to Acquisition/ Improvement 17,817      
Land and improvements, gross 5,910      
Buildings and improvements, gross 40,267      
Land and improvements and buildings and improvements, gross 46,177      
Accumulated Depreciation $ 19,487      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 82,834      
333 Brannan St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 18,645      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 80,685      
Land and improvements, gross 18,645      
Buildings and improvements, gross 80,685      
Land and improvements and buildings and improvements, gross 99,330      
Accumulated Depreciation $ 23,730      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 185,602      
345 Brannan St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 29,405      
Initial cost, buildings and Improvements 113,179      
Costs Capitalized Subsequent  to Acquisition/ Improvement 1,358      
Land and improvements, gross 29,403      
Buildings and improvements, gross 114,539      
Land and improvements and buildings and improvements, gross 143,942      
Accumulated Depreciation $ 23,665      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 110,050      
303 Second St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 63,550      
Initial cost, buildings and Improvements 154,153      
Costs Capitalized Subsequent  to Acquisition/ Improvement 123,735      
Land and improvements, gross 63,550      
Buildings and improvements, gross 277,888      
Land and improvements and buildings and improvements, gross 341,438      
Accumulated Depreciation $ 159,024      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 784,658      
350 Mission St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 52,815      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 212,906      
Land and improvements, gross 52,815      
Buildings and improvements, gross 212,906      
Land and improvements and buildings and improvements, gross 265,721      
Accumulated Depreciation $ 64,520      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 455,340      
345 Oyster Point Blvd., South San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 13,745      
Initial cost, buildings and Improvements 18,575      
Costs Capitalized Subsequent  to Acquisition/ Improvement 1      
Land and improvements, gross 13,745      
Buildings and improvements, gross 18,576      
Land and improvements and buildings and improvements, gross 32,321      
Accumulated Depreciation $ 4,504      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 40,410      
347 Oyster Point Blvd., South San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 14,071      
Initial cost, buildings and Improvements 18,289      
Costs Capitalized Subsequent  to Acquisition/ Improvement 44      
Land and improvements, gross 14,071      
Buildings and improvements, gross 18,333      
Land and improvements and buildings and improvements, gross 32,404      
Accumulated Depreciation $ 4,455      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 39,780      
349 Oyster Point Blvd., South San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 23,112      
Initial cost, buildings and Improvements 22,601      
Costs Capitalized Subsequent  to Acquisition/ Improvement 352      
Land and improvements, gross 23,112      
Buildings and improvements, gross 22,953      
Land and improvements and buildings and improvements, gross 46,065      
Accumulated Depreciation $ 6,824      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 65,340      
350 Oyster Point Blvd., South San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 23,719      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 177,047      
Land and improvements, gross 23,719      
Buildings and improvements, gross 177,047      
Land and improvements and buildings and improvements, gross 200,766      
Accumulated Depreciation $ 22,614      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 234,892      
352 Oyster Point Blvd., South San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 23,449      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 165,524      
Land and improvements, gross 23,449      
Buildings and improvements, gross 165,524      
Land and improvements and buildings and improvements, gross 188,973      
Accumulated Depreciation $ 23,061      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 232,215      
354 Oyster Point Blvd., South San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 19,538      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 141,063      
Land and improvements, gross 19,538      
Buildings and improvements, gross 141,063      
Land and improvements and buildings and improvements, gross 160,601      
Accumulated Depreciation $ 22,126      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 193,472      
Oyster Point Blvd South San Francisco CA Seven        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 0      
Land and improvements, gross 0      
Buildings and improvements, gross 0      
Land and improvements and buildings and improvements, gross 0      
Accumulated Depreciation $ 62      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 0      
10900 NE 4th St., Bellevue, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 25,080      
Initial cost, buildings and Improvements 150,877      
Costs Capitalized Subsequent  to Acquisition/ Improvement 66,352      
Land and improvements, gross 25,080      
Buildings and improvements, gross 217,229      
Land and improvements and buildings and improvements, gross 242,309      
Accumulated Depreciation $ 106,671      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 428,557      
601 108th Ave., Bellevue, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 214,095      
Costs Capitalized Subsequent  to Acquisition/ Improvement 99,439      
Land and improvements, gross 42,680      
Buildings and improvements, gross 270,854      
Land and improvements and buildings and improvements, gross 313,534      
Accumulated Depreciation $ 136,292      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 490,738      
2001 8th Ave., Seattle, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 84,076      
Initial cost, buildings and Improvements 371,154      
Costs Capitalized Subsequent  to Acquisition/ Improvement 36,691      
Land and improvements, gross 84,076      
Buildings and improvements, gross 407,845      
Land and improvements and buildings and improvements, gross 491,921      
Accumulated Depreciation $ 53,879      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 535,395      
320 Westlake Ave. North, Seattle, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 14,710      
Initial cost, buildings and Improvements 82,018      
Costs Capitalized Subsequent  to Acquisition/ Improvement 16,653      
Land and improvements, gross 14,710      
Buildings and improvements, gross 98,671      
Land and improvements and buildings and improvements, gross 113,381      
Accumulated Depreciation $ 41,086      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 184,644      
321 Terry Ave. North, Seattle, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 10,430      
Initial cost, buildings and Improvements 60,003      
Costs Capitalized Subsequent  to Acquisition/ Improvement 11,066      
Land and improvements, gross 10,430      
Buildings and improvements, gross 71,069      
Land and improvements and buildings and improvements, gross 81,499      
Accumulated Depreciation $ 30,777      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 135,755      
401 Terry Ave. North, Seattle, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 22,500      
Initial cost, buildings and Improvements 77,046      
Costs Capitalized Subsequent  to Acquisition/ Improvement 235      
Land and improvements, gross 22,500      
Buildings and improvements, gross 77,281      
Land and improvements and buildings and improvements, gross 99,781      
Accumulated Depreciation $ 28,806      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 174,530      
333 Dexter Ave. North, Seattle, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 42,854      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 328,064      
Land and improvements, gross 42,854      
Buildings and improvements, gross 328,064      
Land and improvements and buildings and improvements, gross 370,918      
Accumulated Depreciation $ 48,068      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 618,766      
701 N. 34th St., Seattle, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 48,027      
Costs Capitalized Subsequent  to Acquisition/ Improvement 16,696      
Land and improvements, gross 0      
Buildings and improvements, gross 64,723      
Land and improvements and buildings and improvements, gross 64,723      
Accumulated Depreciation $ 28,986      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 143,136      
801 N. 34th St., Seattle, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 58,537      
Costs Capitalized Subsequent  to Acquisition/ Improvement 23,925      
Land and improvements, gross 0      
Buildings and improvements, gross 82,462      
Land and improvements and buildings and improvements, gross 82,462      
Accumulated Depreciation $ 37,188      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 173,615      
837 N. 34th St., Seattle, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 37,404      
Costs Capitalized Subsequent  to Acquisition/ Improvement 8,619      
Land and improvements, gross 0      
Buildings and improvements, gross 46,023      
Land and improvements and buildings and improvements, gross 46,023      
Accumulated Depreciation $ 21,410      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 112,487      
200 W. 6th St., Austin, TX        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 664,974      
Land and improvements, gross 0      
Buildings and improvements, gross 664,974      
Land and improvements and buildings and improvements, gross 664,974      
Accumulated Depreciation $ 60,117      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 758,975      
1550 N. El Centro Avenue, Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 16,970      
Initial cost, buildings and Improvements 39      
Costs Capitalized Subsequent  to Acquisition/ Improvement 139,686      
Land and improvements, gross 16,970      
Buildings and improvements, gross 139,725      
Land and improvements and buildings and improvements, gross 156,695      
Accumulated Depreciation $ 38,230      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 0      
6390 De Longpre Ave., Los Angeles, CA (5)        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 12,112      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 162,693      
Land and improvements, gross 12,112      
Buildings and improvements, gross 162,693      
Land and improvements and buildings and improvements, gross 174,805      
Accumulated Depreciation $ 22,108      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 0      
3200 Paseo Village Way, San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 106,419      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 272,319      
Land and improvements, gross 106,419      
Buildings and improvements, gross 272,319      
Land and improvements and buildings and improvements, gross 378,738      
Accumulated Depreciation $ 46,203      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 0      
Office Building        
Real Estate and Accumulated Depreciation [Line Items]        
Unamortized deferred financing costs $ (7,800)      
Office Building | El Camino Real, San Diego, California Eight        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances 375,000      
Office Building | 100 Hooper St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances 148,815      
Office Building | 320 Westlake Ave. North, WA and 321 Terry Avenue North, Lake Union, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances $ 76,627      
Office Building | Sunset Blvd., Gower St. and El Centro Ave. Properties in Los Angeles        
Real Estate and Accumulated Depreciation [Line Items]        
Number of buildings | property 5      
Operating Properties        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances $ 600,442      
Initial cost, land and improvements 1,550,535      
Initial cost, buildings and Improvements 3,163,966      
Costs Capitalized Subsequent  to Acquisition/ Improvement 5,432,898      
Land and improvements, gross 1,641,913      
Buildings and improvements, gross 8,505,486      
Land and improvements and buildings and improvements, gross 10,147,399      
Accumulated Depreciation $ 2,843,811      
Rentable square feet (unaudited) | ft² 16,292,164      
Undeveloped land and construction in progress        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances $ 0      
Initial cost, land and improvements 787,640      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 1,600,102      
Land and improvements, gross 787,640      
Buildings and improvements, gross 1,600,102      
Land and improvements and buildings and improvements, gross 2,387,742      
Accumulated Depreciation $ 0      
Rentable square feet (unaudited) | ft² 0      
Residential Tower | Sunset Blvd., Gower St. and El Centro Ave. Properties in Los Angeles        
Real Estate and Accumulated Depreciation [Line Items]        
Number of buildings | property 1