Cover page Statement [Table] Statement [Table] Class of Stock [Axis] Class of Stock [Domain] Common stock representing ownership interest in a corporation. Common Stock No Class [Member] Common shares Common Class B [Member] Class B Common Shares Class B Statement [Line Items] Statement [Line Items] Document Type Document Type Document Quarterly Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Securities Act File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Condensed Consolidated Balance Sheets Assets [Abstract] ASSETS Real Estate Investment Property, at Cost [Abstract] Real estate, at cost: Land and Land Improvements Land and improvements Investment Building and Building Improvements Buildings and improvements Development in Process Construction in progress, including land Real Estate Investment Property, at Cost Real estate, at cost Real Estate Investment Property, Accumulated Depreciation Less: accumulated depreciation Real Estate Investment Property, Net Real estate, net Real estate, net Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Cash and cash equivalents Restricted Cash Restricted cash Restricted cash Accounts and Financing Receivable, after Allowance for Credit Loss Tenant and other receivables Deferred Rent Receivables, Net Deferred rent receivable Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures Investments in unconsolidated real estate ventures Total investments in unconsolidated real estate ventures Deferred Costs, Leasing, Net Deferred leasing costs, net Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Other Assets Other assets, net Total other assets, net Assets TOTAL ASSETS Liabilities and Equity [Abstract] Combined balance sheet information: LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY Liabilities [Abstract] Liabilities: Secured Debt Mortgage loans, net Mortgage loan, net Long-Term Line of Credit Revolving credit facility Unsecured Debt Term loans, net Accounts Payable and Accrued Liabilities Accounts payable and accrued expenses Other Liabilities Total other liabilities, net Other liabilities, net Liabilities Total liabilities Commitments And Contingencies. Commitments and contingencies Redeemable Noncontrolling Interest, Equity, Carrying Amount Balance, end of period Balance, beginning of period Redeemable noncontrolling interests Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Shareholders' equity: Preferred Stock, Value, Issued Preferred shares, $0.01 par value - 200,000 shares authorized; none issued Common Stock, Value, Issued Common shares Additional Paid in Capital Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income (loss) Equity, Including Portion Attributable to Noncontrolling Interest Balance at end of period Balance at beginning of period Total equity Liabilities and Equity TOTAL LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY Preferred Stock, Par or Stated Value Per Share Preferred shares, par value (in dollars per share) Preferred Stock, Shares Authorized Preferred shares, shares authorized Preferred Stock, Shares Issued Preferred shares, shares issued Common Stock, Par or Stated Value Per Share Common shares, par value (in dollars per share) Common Stock, Shares Authorized Common shares, shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Outstanding Balance at end of period (in shares) Balance at beginning of period (in shares) Common shares, shares outstanding Condensed Consolidated Statements of Operations Revenues [Abstract] REVENUE Operating Lease, Lease Income Property rental Property rental revenue Revenue from Contract with Customer, Including Reimbursements. Revenue From Contract With Customers, Including Reimbursements Third-party real estate services, including reimbursements Other Income Other revenue Revenues Revenues Total revenue Total revenue Costs and Expenses [Abstract] EXPENSES Depreciation, Depletion and Amortization, Nonproduction Depreciation and amortization Depreciation and amortization expense Direct Costs of Leased and Rented Property or Equipment Property operating Real Estate Tax Expense Real estate taxes General and Administrative Expense [Abstract] General and administrative: Other General and Administrative Expense Corporate and other Amounts of expenses related to third-party real estate services. Third Party Real Estate Services Third-party real estate services Transaction And Other Costs Transaction and Other Costs Transaction and other costs Transaction and other costs Costs and Expenses Total expenses Nonoperating Income (Expense) [Abstract] OTHER INCOME (EXPENSE) Income (Loss) from Equity Method Investments Loss from unconsolidated real estate ventures, net Loss from unconsolidated real estate ventures, net Investment Income, Net Interest and other income, net Interest Expense, Nonoperating Interest expense Interest expense Interest expense Gains (Losses) on Sales of Investment Real Estate Gain on the sale of real estate, net Gain on the sale of real estate, net Gain (loss) on sale of real estate Gain (Loss) on Extinguishment of Debt Loss on the extinguishment of debt, net Loss on the extinguishment of debt, net Asset Impairment Charges Impairment loss Impairment loss Nonoperating Income (Expense) Total other income (expense) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest LOSS BEFORE INCOME TAX (EXPENSE) BENEFIT Income Tax Expense (Benefit) Income tax (expense) benefit Net Income (Loss), Including Portion Attributable to Noncontrolling Interest NET LOSS NET LOSS Net loss Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Net loss attributable to redeemable noncontrolling interests NET LOSS ATTRIBUTABLE TO COMMON SHAREHOLDERS Net loss attributable to common shareholders Shareholders' Equity and Loss Per Common Share LOSS PER COMMON SHARE: Earnings Per Share, Basic Loss per common share - basic LOSS PER COMMON SHARE - BASIC Earnings Per Share, Diluted Loss per common share - diluted LOSS PER COMMON SHARE - DILUTED Weighted Average Number of Shares Outstanding, Basic WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING - BASIC Weighted average number of common shares outstanding - basic Weighted Average Number of Shares Outstanding, Diluted WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING - DILUTED Weighted average number of common shares outstanding - diluted Condensed Consolidated Statements of Comprehensive Loss Other Comprehensive Income (Loss), Net of Tax [Abstract] OTHER COMPREHENSIVE INCOME (LOSS) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Change in fair value of derivative financial instruments Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Reclassification of net income on derivative financial instruments from accumulated other comprehensive income (loss) into interest expense Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total other comprehensive income (loss) Total other comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest COMPREHENSIVE LOSS Amount of net income (loss) attributable to redeemable noncontrolling interest included in comprehensive income. Comprehensive Net Loss Attributable To Redeemable Noncontrolling Interest Net loss attributable to redeemable noncontrolling interests Comprehensive Other Income (Loss), Net Of Tax, Attributable To Redeemable Noncontrolling Interest. Comprehensive Income (Loss), Net Of Tax, Attributable To Redeemable Noncontrolling Interest Other comprehensive (income) loss attributable to redeemable noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Parent COMPREHENSIVE LOSS ATTRIBUTABLE TO JBG SMITH PROPERTIES Condensed Consolidated Statements of Equity Equity Components [Axis] Equity Component [Domain] Common Stock [Member] Common Shares Additional Paid-in Capital [Member] Additional Paid-In Capital Retained Earnings [Member] Accumulated Deficit AOCI Including Portion Attributable to Noncontrolling Interest [Member] Accumulated Other Comprehensive Income (Loss) Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Value of stock issued during the period upon the redemption of OP units. Redemption of Operating Partnership units for common shares Redemption of common limited partnership units ("OP Units") Common Shares Issued During Period in Connection with Redemption of OP Units. Common Shares Issued During Periods In Connection With Redemption Of OP Units Redemption of common limited partnership units to common shares Redemption of common limited partnership units ("OP Units") (in shares) Stock Repurchased and Retired During Period, Value Common shares repurchased Stock Repurchased and Retired During Period, Shares Common shares repurchased (in shares) Repurchase and retired common shares Aggregate change in value for stock issued during the period as a result of employee incentive compensation plan and employee stock purchase plan. Stock Issued During Period, Value, Employee Incentive Compensation And Employee Stock Purchase Plan Common shares issued pursuant to employee incentive compensation plan and Employee Share Purchase Plan ("ESPP") Number of shares issued during the period as a result of employee incentive compensation plan and employee stock purchase plan. Stock Issued During Period, Shares, Employee Incentive Compensation And Employee Stock Purchase Plan Common shares issued pursuant to employee incentive compensation plan and Employee Share Purchase Plan ("ESPP") (in shares) Stock Issued During Period, Value, New Issues Issuance of Class B Common Shares Stock Issued During Period, Shares, New Issues Issuance of Class B Common Shares (in shares) Redeemable noncontrolling interests redemption value adjustment and other comprehensive income loss allocation. Minority Interest Change In Redemption Value And Other Comprehensive Income Loss Allocation Redeemable noncontrolling interests redemption value adjustment and total other comprehensive loss allocation Condensed Consolidated Statements of Cash Flows Net Cash Provided by (Used in) Operating Activities [Abstract] OPERATING ACTIVITIES Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash provided by operating activities: Share-Based Payment Arrangement, Noncash Expense Share-based compensation expense Depreciation, Depletion and Amortization Depreciation and amortization expense, including amortization of deferred financing costs Straight Line Rent Deferred rent Amortization Of Acquired Below-Market Lease, Net Of Acquired Above-Market Lease Amortization Of Acquired Below-Market Lease, Net Of Acquired Above-Market Lease Amortization (accretion) of market lease intangibles, net Amount of amortization of lease incentive costs incurred by the lessor for the benefit of the lessee. Amortization of Lease Incentive Amortization of lease incentives Amount of gain (loss) on extinguishment of debt, net of the gain (loss) on the termination of interest rate swap. Gain Loss On Extinguishment Of Debt Net Termination Of Interest Rate Swap Loss on the extinguishment of debt, net The amount of gain and loss on operating lease and other receivables. Gain (Loss) on Operating Lease and Other Receivables Loss on operating lease and other receivables Debt and Equity Securities, Gain (Loss) (Income) loss from investments, net Proceeds from Equity Method Investment, Distribution Return on capital from unconsolidated real estate ventures Other Noncash Income (Expense) Other non-cash items Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Accounts and Notes Receivable Tenant and other receivables Increase (Decrease) in Other Operating Assets Other assets, net Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable and accrued expenses Increase (Decrease) in Other Operating Liabilities Other liabilities, net Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] INVESTING ACTIVITIES Payments to develop real estate assets, construction in progress, and real estate additions. Payments To Develop Real Estate Assets Construction in Progress And Real Estate Additions Development costs, construction in progress and real estate additions Proceeds from Sale, Real Estate, Held-for-Investment Proceeds from the sale of real estate Proceeds from Derivative Instrument, Investing Activities Proceeds from derivative financial instruments Proceeds from Equity Method Investment, Distribution, Return of Capital Distributions of capital from unconsolidated real estate ventures and other investments Payments to Acquire Real Estate and Real Estate Joint Ventures Investments in unconsolidated real estate ventures and other investments Net Cash Provided by (Used in) Investing Activities Net cash provided by investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] FINANCING ACTIVITIES Proceeds from Notes Payable Borrowings under mortgage loans Proceeds from Lines of Credit Borrowings under revolving credit facility Repayments of Notes Payable Repayments of mortgage loans Repayments of Lines of Credit Repayments of revolving credit facility Payments for Derivative Instrument, Financing Activities Payments on derivative financial instruments Payments of Debt Issuance Costs Debt issuance and modification costs Payments for Repurchase of Redeemable Noncontrolling Interest Redemption of noncontrolling interests Proceeds from Stock Plans Proceeds from common shares issued pursuant to ESPP Payments for Repurchase of Common Stock Common shares repurchased Payments of Ordinary Dividends, Common Stock Dividends paid to common shareholders Payments of Ordinary Dividends, Noncontrolling Interest Distributions to redeemable noncontrolling interests Net Cash Provided by (Used in) Financing Activities Net cash used in financing activities Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net increase (decrease) in cash and cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Cash and cash equivalents, and restricted cash, end of period Cash and cash equivalents, and restricted cash, beginning of period Cash and cash equivalents, and restricted cash Supplemental Cash Flow Information [Abstract] SUPPLEMENTAL DISCLOSURE OF CASH FLOW AND NON-CASH INFORMATION Interest Paid, Excluding Capitalized Interest, Operating Activities Cash paid for interest (net of capitalized interest of $400 and $998 in 2026 and 2025) Capital Expenditures Incurred but Not yet Paid Accrued capital expenditures Write-Off Of Fully Depreciated Assets, Including Asset Impairment Write-Off Of Fully Depreciated Assets, Including Asset Impairment Write-off of fully depreciated assets Income Taxes Paid, Net Cash paid for income taxes Conversion of Stock, Amount Converted Redemption of OP Units for common shares Amount of redemption noncontrolling interests redemption value adjustment. Redemption Noncontrolling Interests Redemption Value Adjustment Redeemable noncontrolling interests redemption value adjustment Future cash outflow to pay for repurchases of common shares pending settlement. Common Shares Repurchased Pending Settlement Not Yet Paid Accrual for common shares repurchased pending settlement Operating Lease, Payments Cash paid for amounts included in the measurement of lease liabilities for operating leases Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH, END OF PERIOD Interest Paid, Capitalized, Investing Activities Capitalized interest Organization and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Organization and Basis of Presentation Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Dispositions Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Dispositions