Revenue Recognition. The Company records rental revenue from operating leases on a straight-line basis over the term of the leases and maintains an allowance for estimated losses that may result from the inability of its tenants to make required payments. If tenants fail to make contractual lease payments that are greater than the Companys allowance for doubtful accounts, security deposits and letters of credit, then the Company may have to recognize additional doubtful account charges in future periods. The Company monitors the liquidity and creditworthiness of its tenants on an on-going basis by reviewing their financial condition periodically as appropriate. Each period the Company reviews its outstanding accounts receivable, including straight-line rents, for doubtful accounts and provides allowances as needed. The Company also records lease termination fees when a tenant has executed a definitive termination agreement with the Company and the payment of the termination fee is not subject to any conditions that must be met or waived before the fee is due to the Company. If a tenant remains in the leased space following the execution of a definitive termination agreement, the applicable termination will be deferred and recognized over the term of such tenants occupancy. ? Tenant expense reimbursement income includes payments and amounts due from tenants pursuant to their leases for real estate taxes, insurance and other recoverable property operating expenses and is recognized as revenues during the same period the related expenses are incurred. ? As of June 30, 2018 and December 31, 2017, approximately $24.1 million and $23.0 million, respectively, of straight-line rent and accounts receivable, net of allowances of approximately $0.3 million and $0.1 million as of June 30, 2018 and December 31, 2017, respectively, were included as a component of other assets in the accompanying consolidated balance sheets.