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Summary of Significant Accounting Policies - Future Amortization of Deferred Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Year Ending December 31,
2020 (Remaining)	$ 9,754
2021	36,627
2022	35,503
2023	34,429
2024	32,040
Thereafter	238,487
Total	386,840
Total	(35,533)	$ (26,668)
Lease intangibles (in-place)
Year Ending December 31,
2020 (Remaining)	5,529
2021	19,342
2022	18,242
2023	17,246
2024	15,812
Thereafter	88,250
Total	164,421
Lease intangibles (above-market)
Year Ending December 31,
2020 (Remaining)	5,876
2021	23,317
2022	22,370
2023	21,460
2024	19,791
Thereafter	165,138
Total	257,952
Lease intangibles (below-market)
Year Ending December 31,
2020 (Remaining)	(1,651)
2021	(6,032)
2022	(5,109)
2023	(4,277)
2024	(3,563)
Thereafter	(14,901)
Total	$ (35,533)

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