Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2019

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, 2019 and December 31, 2018 (in thousands):

	June 30, 2019			December 31, 2018
Identified intangible assets (included in other assets):
Gross amount	$	282,932		$	266,540
Accumulated amortization	(247,418		)	(241,040		)
Net(1)	$	35,514		$	25,500
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	311,091		$	276,245
Accumulated amortization	(258,222		)	(253,767		)
Net(1)	$	52,869		$	22,478

(1)

As of June 30, 2019, and December 31, 2018, no 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

At June 30, 2019 and December 31, 2018, we held the following marketable securities (in thousands):

	June 30, 2019		December 31, 2018
Commercial mortgage-backed securities	$	29,978	$	28,638
Total marketable securities available-for-sale	$	29,978	$	28,638

Schedules of Concentration of Risk, by Risk Factor

For the three months ended June 30, 2019, the following properties contributed more than 5.0% of our annualized cash rent, including our share of joint venture annualized cash rent:

Property	Three months ended June 30, 2019
1185 Avenue of the Americas	7.2%
11 Madison Avenue	7.1%
420 Lexington Avenue	6.4%
1515 Broadway	5.9%
One Madison Avenue	5.8%