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Commitments and Contingencies
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Commitments and Contingencies Commitments and Contingencies
Ground Leases

We are obligated as lessee under four ground leases. Future minimum rental payments due under the terms of these leases as of December 31, 2020, are as follows (dollars in thousands):

YearFuture Lease Payments Due Under Operating Leases
2021$477 
2022489 
2023492 
2024493 
2025494 
Thereafter7,305 
Total anticipated lease payments$9,750 
Less: amount representing interest(4,063)
Present value of lease payments$5,687 

Rental expense incurred for properties with ground lease obligations was $0.5 million each for the years ended December 31, 2020, 2019 and 2018. Our ground leases are treated as operating leases and rental expenses are reflected in property operating expenses on the consolidated statements of operations and comprehensive income. Our ground leases have a weighted average remaining lease term of 20.1 years and weighted average discount rate of 5.32%.

Letters of Credit

As of December 31, 2020, there was $16.4 million outstanding under letters of credit. These letters of credit are not reflected on our consolidated balance sheet.