Recognition of revenue. Our revenues, which are composed largely of rental income, include rents reported on a straight-line basis over the lease term. In accordance with ASC 805 Business Combinations, we recognize rental revenue of acquired in-place above- and below-market leases at their fair values over the terms of the respective leases. Reimbursements of operating costs, as allowed under most of our commercial tenant leases, consist of amounts due from tenants for common area maintenance, real estate taxes and other recoverable costs, and are recognized as revenue in the period in which the recoverable expenses are incurred. We record these reimbursements on a gross basis, since we generally are the primary obligor with respect to purchasing goods and services from third-party suppliers, have discretion in selecting the supplier and have the credit risk with respect to paying the supplier. Rental income for residential property leases is recorded when due from residents and is recognized monthly as earned, which is not materially different than on a straight-line basis as lease terms are generally for periods of one year or less. For hotel properties, revenues for room sales and guest services are recognized as rooms occupied and services rendered. An allowance for doubtful accounts is recorded for all past due rents and operating expense reimbursements considered to be uncollectible. Sales and the associated gains or losses of real estate assets are recognized in accordance with the provisions of ASC Topic 360-20, Property, Plant and Equipment  Real Estate Sale. The specific timing of a sale is measured against various criteria in ASC 360-20 related to the terms of the transaction and any continuing involvement in the form of management or financial assistance associated with the properties. If the sales criteria for the full accrual method are not met, the Company defers some or all of the gain recognition and accounts for the continued operations of the property by applying the finance, leasing, deposit, installment or cost recovery methods, as appropriate, until the sales criteria are met.