Investments in Unconsolidated Real Estate Ventures - Summary of Dispositions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Income (loss) from unconsolidated real estate ventures, net	$ (17,429)	$ (2,070)	$ (20,336)
Disposal Group, Disposed of by Sale
Schedule of Equity Method Investments [Line Items]
Income (loss) from unconsolidated real estate ventures, net	$ 6,797	$ 28,326	$ (2,152)
Landmark | Minimum
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)	18.00%
Landmark | Maximum
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)	49.00%
Landmark | Courthouse Metro | Disposal Group, Disposed of by Sale
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)		18.00%
Gross sales price		$ 3,000
Income (loss) from unconsolidated real estate ventures, net		$ 2,352
Landmark | 5615 Fishers Lane | Disposal Group, Disposed of by Sale
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)		18.00%
Gross sales price		$ 6,500
Income (loss) from unconsolidated real estate ventures, net		$ 743
Landmark | 500 L'Enfant Plaza | Disposal Group, Disposed of by Sale
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)		49.00%
Gross sales price		$ 166,500
Repayment of mortgage		80,000
Income (loss) from unconsolidated real estate ventures, net		$ 23,137
Landmark | Woodglen | Disposal Group, Disposed of by Sale
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)			18.00%
Gross sales price			$ 17,750
Repayment of mortgage			12,213
Income (loss) from unconsolidated real estate ventures, net			$ (2,952)
Landmark | The Alaire,The Terano and Parklawn Drive | Disposal Group, Disposed of by Sale
Schedule of Equity Method Investments [Line Items]
Gross sales price	$ 137,500
Repayment of mortgage	79,829
Income (loss) from unconsolidated real estate ventures, net	$ 5,243
Landmark | The Alaire,The Terano and Parklawn Drive | Disposal Group, Disposed of by Sale | Minimum
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)	1.80%
Landmark | The Alaire,The Terano and Parklawn Drive | Disposal Group, Disposed of by Sale | Maximum
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)	18.00%
Landmark | Galvan | Disposal Group, Disposed of by Sale
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)	1.80%
Gross sales price	$ 152,500
Repayment of mortgage	89,500
Income (loss) from unconsolidated real estate ventures, net	$ 407
CPPIB Venture Partner | 1900 N Street | Disposal Group, Disposed of by Sale
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)	55.00%
Gross sales price	$ 265,000
Repayment of mortgage	151,709
Income (loss) from unconsolidated real estate ventures, net	$ 529
CBREI Venture | Minimum
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)	9.90%
CBREI Venture | Maximum
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)	10.00%
CBREI Venture | Fairway | Disposal Group, Disposed of by Sale
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)		10.00%
Gross sales price		$ 93,000
Repayment of mortgage		45,343
Income (loss) from unconsolidated real estate ventures, net		$ 2,094
CBREI Venture | Pickett Industrial Park | Disposal Group, Disposed of by Sale
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)			10.00%
Gross sales price			$ 46,250
Repayment of mortgage			23,572
Income (loss) from unconsolidated real estate ventures, net			$ 800
CBREI Venture | The Gale Eckington | Disposal Group, Disposed of by Sale
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)	5.00%
Gross sales price	$ 215,550
Repayment of mortgage	110,813
Income (loss) from unconsolidated real estate ventures, net	$ 618