Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Summary of balances of major classes of depreciable assets and their respective estimated useful lives

Balances of major classes of depreciable assets (in thousands) and their respective estimated useful lives are:



		December 31,
Asset Category	Estimated Useful Life	2015		2014
Land	Non-depreciable	$	406,271	$	412,578
Buildings and garages	40 years	2,519,587		2,535,757
Building improvements	7 to 40 years	57,381		52,715
Tenant improvements	Lesser of useful life or term of lease	348,782		332,850
		$	3,332,021	$	3,333,900

Above (below) market ground leases, net

Finite-Lived Intangible Assets [Line Items]

Summary of remaining amortization of net below market leases

As of December 31, 2015, the remaining amortization of net below market leases is projected as a net increase to rental income as follows (in thousands):



	Amount
2016	$	7,182
2017	5,281
2018	3,854
2019	4,394
2020	4,750
Thereafter	15,304
Total	$	40,765

Lease in place value

Finite-Lived Intangible Assets [Line Items]

Summary of remaining amortization of net below market leases

As of December 31, 2015, the remaining amortization expense for the value of in-place leases is projected as follows (in thousands):



	Amount
2016	$	28,364
2017	20,693
2018	13,804
2019	10,336
2020	8,164
Thereafter	16,835
Total	$	98,196