Revenue Recognition Rental and Related Revenue The timing of revenue recognition under an operating lease is determined based upon ownership of the tenant improvements. If we are the owner of the tenant improvements, revenue recognition commences after the improvements are completed and the tenant takes possession or control of the space. If we determine that the tenant allowances or improvements we are funding are lease incentives, then we commence revenue recognition when possession or control of the space is turned over to the tenant. Rental income from leases is recognized on a straight-line basis. We record lease termination fees when a tenant has executed a definitive termination agreement with us and the payment of the termination fee is not subject to any material conditions that must be met or waived before the fee is due to us. General Contractor and Service Fee Revenue Management fees are based on a percentage of rental receipts of properties managed and are recognized as the rental receipts are collected. Maintenance fees are based upon established hourly rates and are recognized as the services are performed. Construction management and development fees represent fee-based third-party contracts and are recognized as earned based on the percentage of completion method. We recognize income on construction contracts where we serve as a general contractor on the percentage of completion method. Using this method, profits are recorded based on our estimates of the percentage of completion of individual contracts, commencing when the work performed under the contracts reaches a point where the final costs can be estimated with reasonable accuracy. The percentage of completion estimates are based on a comparison of the contract expenditures incurred to the estimated final costs. Changes in job performance, job conditions and estimated profitability may result in revisions to costs and income and are recognized in the period in which the revisions are determined. To the extent that a fixed-price contract is