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Intangible Assets, Liabilities, and Deferred Leasing Costs - Summary of Future Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Amortization Income
2021	$ 6,276
2022	4,798
2023	3,697
2024	2,993
2025	2,558
Thereafter	14,550
Intangible liabilities, net	34,872	$ 42,642
In-place leases
Amortization Expense
2021	17,054
2022	13,151
2023	11,124
2024	9,551
2025	8,331
Thereafter	28,702
Total future amortization expense	87,913
Above-market leases
Amortization Expense
2021	1,804
2022	1,304
2023	1,079
2024	834
2025	627
Thereafter	2,161
Total future amortization expense	7,809
Deferred leasing costs
Amortization Expense
2021	2,842
2022	1,619
2023	1,389
2024	1,114
2025	978
Thereafter	2,789
Total future amortization expense	$ 10,731

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