(4) LEASES

As Lessor:

As lessor, all of our leases are classified as operating leases with initial terms typically ranging from 3 to 15 years with up to five additional, five-year renewal options. Under the terms of the leases, we earn fixed monthly base rents and pursuant to the leases with subsidiaries of UHS, we may earn periodic bonus rents (see Note 1). The bonus rents from the subsidiaries of UHS, which are based upon each facility’s net revenue in excess of base amounts, are computed and paid on a quarterly basis based upon a computation that compares current quarter revenue to the corresponding quarter in the base year.

Minimum future base rents from non-cancelable leases related to properties included in our financial statements on a consolidated basis, excluding increases resulting from changes in the consumer price index, bonus rents and the impact of straight line rent adjustments, are as follows (amounts in thousands):

2018	$	55,022
2019		49,763
2020		44,416
2021		39,387
2022		19,565
Thereafter		56,963
Total minimum base rents	$	265,116

Some of the leases contain gross terms where operating expenses are included in the base rent amounts. Other leases contain net terms where the operating expenses are assessed separately from the base rentals. The table above contains a mixture of both gross and net leases, and does not include any separately calculated operating expense reimbursements. Under the terms of the hospital leases, the lessees are required to pay all operating costs of the properties including property insurance and real estate taxes. Tenants of the medical office buildings generally are required to pay their pro-rata share of the property’s operating costs.

As Lessee:

As of December 31, 2017, we are the lessee with various third parties, including subsidiaries of UHS, in connection with ground leases for land at fourteen of our consolidated properties. Total consolidated amounts expensed relating to the applicable leases in 2017, 2016 and 2015 was approximately $460,000, $450,000 and $448,000, respectively. Total future ground lease payments on a consolidated basis due in each of the next five years and thereafter are as follows (amounts in thousands):

2018	$	464
2019		464
2020		464
2021		464
2022		464
Thereafter		25,435
Total ground lease expense	$	27,755