Deferred Revenue and Acquisition Related Liabilities, net (Tables)

12 Months Ended

Dec. 31, 2018

Deferred Revenue Disclosure [Abstract]

Deferred revenue and acquisition-related liabilities

Deferred revenue and acquisition-related intangible liabilities, net consisted of the following at December 31, 2018 and 2017:

	December 31,
	2018		2017
	(in thousands)
Deferred revenue related to tenant-funded tenant improvements	$	104,558	$	104,260
Other deferred revenue	15,950		10,991
Acquisition-related intangible liabilities, net (1)	29,138		30,639
Total	$	149,646	$	145,890

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(1) See Note 5 “Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, net” for additional information regarding our acquisition-related intangible liabilities.

Estimated amortization of deferred revenue related to tenant-funded improvements

The following is the estimated amortization of deferred revenue related to tenant-funded tenant improvements as of December 31, 2018 for the next five years and thereafter:

Year Ending	(in thousands)
2019	$	16,973
2020	16,265
2021	14,612
2022	13,603
2023	11,857
Thereafter	31,248
Total	$	104,558