Basis of Presentation and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Basis of Presentation and Significant Accounting Policies [Abstract]

Schedule of allocation of rental income between fixed and variable payments

The table below sets forth the allocation of rental income between fixed and variable payments for the year ended December 31, 2019:

	Year Ended
	December 31, 2019
	(in thousands)
Fixed lease payments	$	710,557
Variable lease payments	115,915
Total rental income	$	826,472

Buildings, improvements, and tenant improvements depreciation

The costs of buildings and improvements and tenant improvements are depreciated using the straight-line method of accounting over the estimated useful lives set forth in the table below. Depreciation expense for buildings and improvements for the three years ended December 31, 2019, 2018, and 2017 was $211.9 million, $198.6 million, and $190.5 million, respectively.

Asset Description	Depreciable Lives
Buildings and improvements	25 – 40 years
Tenant improvements	1 – 20 years (1)

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(1)

Tenant improvements are amortized over the shorter of the lease term or the estimated useful life.