Significant Accounting Policies (Tables)

6 Months Ended

Jun. 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 June 30, 2023 and December 31, 2022 (in thousands):

	June 30, 2023		December 31, 2022
Identified intangible assets (included in other assets):
Gross amount	$	189,680	$	403,552
Accumulated amortization	(183,769)		(190,066)
Net	$	5,911	$	213,486
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	205,394	$	361,338
Accumulated amortization	(201,911)		(212,191)
Net	$	3,483	$	149,147

Schedule of marketable securities

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

	June 30, 2023		December 31, 2022
Commercial mortgage-backed securities	$	9,797	$	11,240
Total investment in marketable securities	$	9,797	$	11,240

Schedules of concentration of risk, by risk factor

For the three months ended June 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 June 30, 2023
One Vanderbilt Avenue	15.2%
245 Park Avenue	10.8%
11 Madison Avenue	8.3%
420 Lexington Ave	6.7%
1515 Broadway	6.3%
280 Park Avenue	5.7%
1185 Avenue of the Americas	5.5%