6. Commitments and Contingencies Ground, Building and Submerged Land Leases  We lease 2,086 square feet of commercial space next to The DeSoto for use as an office, retail or conference space, or for any related or ancillary purposes for the hotel and/or atrium space. In December 2007, we signed an amendment to the lease to include rights to the outdoor esplanade adjacent to the leased commercial space. The areas are leased under a six-year operating lease, which expired October 31, 2006 and has been renewed for the third of three optional five-year renewal periods expiring October 31, 2011, October 31, 2016 and October 31, 2021, respectively. Rent expense for this operating lease for each of the three months ended March 31, 2018 and 2017 totaled $18,245 , respectively . We lease, as landlord, the entire fourteenth floor of The DeSoto hotel property to The Chatham Club, Inc. under a ninety-nine year lease expiring July 31, 2086. This lease was assumed upon the purchase of the building under the terms and conditions agreed to by the previous owner of the property. No rental income is recognized under the terms of this lease as the original lump sum rent payment of $990 was received by the previous owner and not prorated over the life of the lease. We lease a parking lot adjacent to the DoubleTree by Hilton Raleigh Brownstone-University in Raleigh, North Carolina. The land is leased under a second amendment, dated April 28, 1998, to a ground lease originally dated May 25, 1966. The original lease is a 50-year operating lease, which expired August 31, 2016. We exercised a renewal option for the first of three additional ten-year periods expiring August 31, 2026, August 31, 2036, and August 31, 2046, respectively. We hold an exclusive and irrevocable option to purchase the leased land at fair market value at August 1, 2018, or at the end of any 10-year renewal period, subject to the payment of an annual fee of $9,000, and other conditions. Rent expense for the three months ended March 31, 2018 and 2017, totaled $27,