Rent Expense - (Tables)

12 Months Ended

Dec. 31, 2018

Leases [Abstract]

Schedule of future minimum lease obligations under non-cancelable ground leases

As of December 31, 2018, the future minimum lease obligations under non-cancelable parking, air, ground, and office leases were as follows (in thousands):

2019	$	3,058
2020	3,013
2021	3,037
2022	3,030
2023	3,017
Thereafter	143,094
Total	$	158,249