Commitments

We lease office space under operating leases. These leases generally contain fixed contractual rent changes and certain of the leases provide for operating expense reimbursements. We recognize rental expense on operating leases that contain fixed contractual rent changes on a straight line basis over the terms of the respective leases. As of September 30, 2016, we had 33 leases that expire at various dates through 2025. We incurred rental expense for the fiscal years ended September 30, 2016, 2015 and 2014 of $4,650, $4,426 and $4,581, respectively, including non‑cash straight line rent expense of $328, $48 and $70, respectively. Rental expense is included in general and administrative expenses in our consolidated statements of comprehensive income. Certain of these leases also provide us with options to extend the respective terms of the leases. The future scheduled minimum lease payments under the terms of these leases as of September 30, 2016 are as follows (per fiscal year ended September 30):



2017	$	3,957
2018	4,027
2019	3,647
2020	3,227
2021	3,134
Thereafter	12,317
	$	30,309

Some of the foregoing leases are with related parties. As of September 30, 2016, $26,499 of our future scheduled minimum lease payments are for our principal executive offices, which are leased from an affiliate of ABP Trust pursuant to a ten year lease agreement ending in 2025. For more information about these related party leases, see Note 6, Related Person Transactions, above..