Revenue Recognition The Company's revenues, which are derived primarily from rental income, include rents that each tenant pays in accordance with the terms of each lease reported on a straight-line basis over the initial term of the lease. Because many of the Company's leases provide for rental increases at specified intervals, GAAP requires that the Company record a receivable, and include in revenues on a straight-line basis, unbilled rent receivables that it will only receive if the tenant makes all rent payments required through the expiration of the initial term of the lease. The Company defers the revenue related to lease payments received from tenants in advance of their due dates. When the Company acquires a property, the acquisition date is considered to be the commencement date for purposes of this calculation. Rental revenue recognition commences when the tenant takes possession of or controls the physical use of the leased space. For the tenant to take possession, the leased space must be substantially ready for its intended use. To determine whether the leased space is substantially ready for its intended use, the Company evaluates whether the Company owns or if the tenant owns the tenant improvements. When the Company is the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such improvements are substantially complete. When the tenant is the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space. When the Company concludes that it is the owner of tenant improvements, the Company capitalizes the cost to construct the tenant improvements, including costs paid for or reimbursed by the tenants. When the Company concludes that the tenant is the owner of tenant improvements for accounting purposes, the Company records its contribution towards those improvements as a lease incentive, which is included in deferred leasing costs, net on the consolidated balan