Significant Unobservable Inputs | Gross Principal Balance | Mortgages Note Payable

Significant Unobservable Inputs | Fair Value | Mortgages Note Payable

Mortgage note payable — 1140 Avenue of the Americas | Mortgages Note Payable

Mortgage note payable — 1140 Avenue of the Americas | Significant Unobservable Inputs | Gross Principal Balance | Mortgages Note Payable

Mortgage note payable — 1140 Avenue of the Americas | Significant Unobservable Inputs | Fair Value | Mortgages Note Payable

Mortgage note payable — 123 William Street | Significant Unobservable Inputs | Gross Principal Balance | Mortgages Note Payable

Mortgage note payable — 123 William Street | Significant Unobservable Inputs | Fair Value | Mortgages Note Payable

400 E. 67th Street - Laurel Condominium / 200 Riverside Boulevard - ICON Garage | Mortgages Note Payable

400 E. 67th Street - Laurel Condominium / 200 Riverside Boulevard - ICON Garage | Significant Unobservable Inputs | Gross Principal Balance | Mortgages Note Payable

400 E. 67th Street - Laurel Condominium / 200 Riverside Boulevard - ICON Garage | Significant Unobservable Inputs | Fair Value | Mortgages Note Payable

Mortgage note payable — 8713 Fifth Avenue | Significant Unobservable Inputs | Gross Principal Balance | Mortgages Note Payable

Mortgage note payable — 8713 Fifth Avenue | Significant Unobservable Inputs | Fair Value | Mortgages Note Payable

Mortgage note payable — 196 Orchard Street | Significant Unobservable Inputs | Gross Principal Balance | Mortgages Note Payable

Mortgage note payable — 196 Orchard Street | Significant Unobservable Inputs | Fair Value | Mortgages Note Payable

Fair Value of Financial Instruments - Schedule of Financial Instruments that are Not Reported at Fair Value (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairments of real estate investments	$ 0	$ 0
Significant Unobservable Inputs \| Gross Principal Balance \| Mortgages Note Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage notes payable	350,000,000		$ 350,000,000
Significant Unobservable Inputs \| Fair Value \| Mortgages Note Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage notes payable	290,246,000		287,460,000
Mortgage note payable — 1140 Avenue of the Americas \| Mortgages Note Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairments of real estate investments				$ 66,100,000
Mortgage note payable — 1140 Avenue of the Americas \| Significant Unobservable Inputs \| Gross Principal Balance \| Mortgages Note Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage notes payable	99,000,000		99,000,000
Mortgage note payable — 1140 Avenue of the Americas \| Significant Unobservable Inputs \| Fair Value \| Mortgages Note Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage notes payable	69,238,000		69,238,000
Mortgage note payable — 123 William Street \| Significant Unobservable Inputs \| Gross Principal Balance \| Mortgages Note Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage notes payable	140,000,000		140,000,000
Mortgage note payable — 123 William Street \| Significant Unobservable Inputs \| Fair Value \| Mortgages Note Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage notes payable	134,068,000		132,474,000
400 E. 67th Street - Laurel Condominium / 200 Riverside Boulevard - ICON Garage \| Mortgages Note Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairments of real estate investments			25,800,000
400 E. 67th Street - Laurel Condominium / 200 Riverside Boulevard - ICON Garage \| Significant Unobservable Inputs \| Gross Principal Balance \| Mortgages Note Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage notes payable	50,000,000		50,000,000
400 E. 67th Street - Laurel Condominium / 200 Riverside Boulevard - ICON Garage \| Significant Unobservable Inputs \| Fair Value \| Mortgages Note Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage notes payable	31,671,000		31,671,000
Mortgage note payable — 8713 Fifth Avenue \| Significant Unobservable Inputs \| Gross Principal Balance \| Mortgages Note Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage notes payable	10,000,000		10,000,000
Mortgage note payable — 8713 Fifth Avenue \| Significant Unobservable Inputs \| Fair Value \| Mortgages Note Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage notes payable	9,348,000		9,181,000
Mortgage note payable — 196 Orchard Street \| Significant Unobservable Inputs \| Gross Principal Balance \| Mortgages Note Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage notes payable	51,000,000		51,000,000
Mortgage note payable — 196 Orchard Street \| Significant Unobservable Inputs \| Fair Value \| Mortgages Note Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage notes payable	$ 45,921,000		$ 44,896,000