Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023		December 31, 2022
Identified intangible assets (included in other assets):
Gross amount	$	403,552	$	403,552
Accumulated amortization	(203,075)		(190,066)
Net	$	200,477	$	213,486
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	361,338	$	361,338
Accumulated amortization	(222,036)		(212,191)
Net	$	139,302	$	149,147

Schedule of marketable securities

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

	March 31, 2023		December 31, 2022
Commercial mortgage-backed securities	$	10,273	$	11,240
Total investment in marketable securities	$	10,273	$	11,240

Schedules of concentration of risk, by risk factor

For the three months ended March 31, 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 March 31, 2023
One Vanderbilt Avenue	14.4%
245 Park Avenue	10.6%
11 Madison Avenue	8.0%
420 Lexington Ave	6.3%
1515 Broadway	6.0%
280 Park Avenue	5.3%
1185 Avenue of the Americas	5.2%