Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2023

Accounting Policies [Abstract]

Summary of identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases)

The following summarizes our identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases) as of September 30, 2023 and December 31, 2022 (in thousands):

	September 30, 2023		December 31, 2022
Identified intangible assets (included in other assets):
Gross amount	$	189,680	$	403,552
Accumulated amortization	(184,491)		(190,066)
Net	$	5,189	$	213,486
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	205,394	$	361,338
Accumulated amortization	(202,000)		(212,191)
Net	$	3,394	$	149,147

Schedule of marketable securities

As of September 30, 2023 and December 31, 2022, we held the following marketable securities (in thousands):

	September 30, 2023		December 31, 2022
Commercial mortgage-backed securities	$	9,616	$	11,240
Total investment in marketable securities	$	9,616	$	11,240

Schedules of concentration of risk, by risk factor

For the three months ended September 30, 2023, the following properties contributed more than 5.0% of our annualized cash rent from office properties, including our share of annualized cash rent from joint venture office properties:

Property	Three months ended September 30, 2023
One Vanderbilt Avenue	15.6%
11 Madison Avenue	8.3%
420 Lexington Ave	6.8%
1515 Broadway	6.4%
245 Park Avenue	5.7%
280 Park Avenue	5.7%
1185 Avenue of the Americas	5.5%