Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Schedule of estimated useful lives

Properties are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows:

Category	Term
Building (fee ownership)	40 years
Building improvements	shorter of remaining life of the building or useful life
Building (leasehold interest)	lesser of 40 years or remaining term of the lease
Property under capital lease	remaining lease term
Furniture and fixtures	four to seven years
Tenant improvements	shorter of remaining term of the lease or useful life

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 December 31, 2013 and 2012 (in thousands):

	December 31,
	2013			2012
Identified intangible assets (included in other assets):
Gross amount	$	746,704		$	725,861
Accumulated amortization	(343,339		)	(263,107		)
Net	$	403,365		$	462,754
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	671,380		$	651,921
Accumulated amortization	(429,138		)	(357,225		)
Net	$	242,242		$	294,696

Schedule of estimated annual amortization of acquired below-market leases, net of acquired above-market leases

The estimated annual amortization of acquired below-market leases, net of acquired above-market leases (a component of rental revenue), for each of the five succeeding years is as follows (in thousands):

2014	$	(1,984	)
2015	(2,464		)
2016	(4,632		)
2017	(3,758		)
2018	(4,763		)

Schedule of estimated annual amortization of all other identifiable assets

The estimated annual amortization of all other identifiable assets (a component of depreciation and amortization expense) including tenant improvements for each of the five succeeding years is as follows (in thousands):

2014	$	14,938
2015	10,387
2016	6,878
2017	5,482
2018	3,978

Schedule of marketable securities

At December 31, 2013 and 2012, we held the following marketable securities (in thousands):

	December 31,
	2013		2012
Equity marketable securities	$	4,307	$	2,202
Commercial mortgage-backed securities	24,419		15,575
Rake bonds	3,323		3,652
Total marketable securities available-for-sale	$	32,049	$	21,429