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Summary of Significant Accounting Policies - Future Amortization of Deferred Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Year Ending December 31,
2021 (Remaining)	$ 15,566
2022	60,373
2023	56,874
2024	51,206
2025	48,911
Thereafter	380,120
Total	613,050
Total	(32,544)	$ (35,700)
Lease intangibles (in-place)
Year Ending December 31,
2021 (Remaining)	8,018
2022	30,075
2023	28,016
2024	25,494
2025	23,642
Thereafter	140,967
Total	256,212
Lease intangibles (above-market)
Year Ending December 31,
2021 (Remaining)	9,100
2022	35,604
2023	33,454
2024	29,637
2025	28,758
Thereafter	252,829
Total	389,382
Lease intangibles (below-market)
Year Ending December 31,
2021 (Remaining)	(1,552)
2022	(5,306)
2023	(4,596)
2024	(3,925)
2025	(3,489)
Thereafter	(13,676)
Total	$ (32,544)

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