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Deferred Revenue and Acquisition-Related Intangible Liabilities, net (Tables)
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Deferred Revenue and Acquisition-Related Liabilities
Deferred revenue and acquisition-related intangible liabilities, net consisted of the following at December 31, 2021 and 2020:

December 31,
20212020
(in thousands)
Deferred revenue related to tenant-funded tenant improvements$108,002 $88,645 
Other deferred revenue40,896 26,533 
Acquisition-related intangible liabilities, net (1)
22,253 13,345 
Total$171,151 $128,523
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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, 2021 for the next five years and thereafter:
Year Ending(in thousands)
2022$18,331 
202316,620 
202414,483 
202511,771 
202610,148 
Thereafter36,649 
Total$108,002