Variable Interest Entities (Details)	9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($) ft²	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) ft²	Dec. 31, 2019 USD ($) ft²
Variable Interest Entities [Line Items]
Total VIE assets	$ 6,677,542,000		$ 6,489,544,000
Total VIE liabilities	3,280,663,000		3,083,891,000
Total VIE cash flows	$ 319,879,000	$ 309,218,000
Rentable square feet of office property under development (in sq feet) | ft²	1,400,000
Assets and liabilities of consolidated variable interest entity [Abstract]
Net real estate assets	$ 5,115,168,000		5,032,033,000
Cash and cash equivalents	23,055,000	$ 27,871,000	23,152,000
Accounts receivable	24,589,000		14,002,000
Accrued straight-line rents receivable	284,515,000		268,324,000
Deferred leasing costs, net	255,831,000		258,902,000
Prepaid expense and other assets, net	71,278,000		78,551,000
Accounts payable, accrued expenses and other liabilities	307,294,000		$ 294,976,000
2827 Peachtree JV VIE Not Primary Beneficiary [Member]
Variable Interest Entities [Line Items]
Rentable square feet of office property under development (in sq feet) | ft²			135,000
Total anticipated development costs			$ 79,000,000
Contribution of cash to acquire interest in joint venture			$ 13,300,000
Interest in joint venture (in hundredths)			50.00%
Advance to affiliate			$ 49,600,000
Amount of loan funded to affiliate	0
Term of optional extension			1 year
Risk of loss limited to carrying value	13,700,000
2827 Peachtree JV VIE Not Primary Beneficiary [Member] | London Interbank Offered Rate (LIBOR) [Member]
Variable Interest Entities [Line Items]
Variable interest rate basis			LIBOR
Interest rate, basis spread (in hundredths)			3.00%
Granite Park JV VIE Not Primary Beneficiary [Member]
Variable Interest Entities [Line Items]
Risk of loss limited to carrying value	36,100,000
23Springs JV VIE Not Primary Beneficiary [Member]
Variable Interest Entities [Line Items]
Risk of loss limited to carrying value	37,900,000
SIX50 at Legacy Acquisition VIE [Member]
Variable Interest Entities [Line Items]
Total VIE assets	200,600,000
Total VIE liabilities	3,300,000
Total VIE cash flows	500,000
Midtown West Consolidated Variable Interest Entity [Member]
Variable Interest Entities [Line Items]
Rentable square feet of office property under development (in sq feet) | ft²				150,000
Total anticipated development costs				$ 71,300,000
Contribution of cash to acquire interest in joint venture				$ 20,000,000
Interest in joint venture (in hundredths)				80.00%
Advance to affiliate				$ 46,300,000
Amount of loan funded to affiliate	37,700,000
Assets and liabilities of consolidated variable interest entity [Abstract]
Net real estate assets	60,917,000		$ 53,191,000
Cash and cash equivalents	1,246,000		389,000
Accounts receivable	166,000		0
Accrued straight-line rents receivable	720,000		121,000
Deferred leasing costs, net	2,251,000		1,519,000
Prepaid expense and other assets, net	160,000		163,000
Accounts payable, accrued expenses and other liabilities	$ 1,476,000		646,000
Midtown West Consolidated Variable Interest Entity [Member] | London Interbank Offered Rate (LIBOR) [Member]
Variable Interest Entities [Line Items]
Variable interest rate basis				LIBOR
Interest rate, basis spread (in hundredths)				2.50%
Variable Interest Entity, Partner Interest [Member]
Variable Interest Entities [Line Items]
Partner's interest in joint venture (in hundredths)	20.00%
Variable Interest Entity, Partner Interest [Member] | 2827 Peachtree JV VIE Not Primary Beneficiary [Member]
Variable Interest Entities [Line Items]
Contribution of cash to acquire interest in joint venture			5,600,000
Partner's contribution of property to acquire interest in joint venture			$ 7,700,000
Partner's interest in joint venture (in hundredths)			50.00%
Variable Interest Entity, Partner Interest [Member] | Midtown West Consolidated Variable Interest Entity [Member]
Variable Interest Entities [Line Items]
Partner's contribution of property to acquire interest in joint venture				$ 5,000,000
Partner's interest in joint venture (in hundredths)				20.00%