Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2022

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, 2022 and December 31, 2021 (in thousands):

	March 31, 2022		December 31, 2021
Identified intangible assets (included in other assets):
Gross amount	$	199,722	$	199,722
Accumulated amortization	(184,129)		(182,643)
Net (1)	$	15,593	$	17,079
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	212,767	$	212,767
Accumulated amortization	(210,454)		(210,262)
Net (1)	$	2,313	$	2,505

(1)As of March 31, 2022, no net intangible assets and no net intangible liabilities were reclassified to assets held for sale or liabilities related to assets held for sale. As of December 31, 2021, $1.8 million of net intangible assets and no net intangible liabilities were reclassified to assets held for sale and liabilities related to assets held for sale.

Schedule of marketable securities

As of March 31, 2022 and December 31, 2021, we held the following marketable securities (in thousands):

	March 31, 2022		December 31, 2021
Commercial mortgage-backed securities	$	22,353	$	24,146
Total marketable securities available-for-sale	$	22,353	$	24,146
Equity marketable securities	$	10,536	$	10,606
Total investment in marketable securities	$	32,889	$	34,752

Schedules of concentration of risk, by risk factor

For the three months ended March 31, 2022, 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, 2022
One Vanderbilt Avenue	14.3%
11 Madison Avenue	9.3%
420 Lexington Ave	7.0%
1185 Avenue of the Americas	7.0%
1515 Broadway	6.9%
280 Park Avenue	5.8%