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capitalized below-market lease values are amortized as an increase to rental income over the initial term unless the Company believes that it is likely that the tenant would renew the option whereby the Company would amortize the value attributable to the renewal over the renewal period. 

The aggregate value of other acquired intangible assets, consisting of in-place leases, is measured by the excess of (i) the purchase price paid for a property after adjusting existing in-place leases to market rental rates over (ii) the estimated fair value of the property as-if-vacant, determined as set forth above. The value of in-place leases exclusive of the value of above-market and below-market in-place leases is amortized to expense over the remaining non-cancelable periods of the respective leases. If a lease were to be terminated prior to its stated expiration, all unamortized amounts relating to that lease would be written off. The value of tenant relationships is reviewed on individual transactions to determine if future value was derived from the acquisition. 

Intangible assets and liabilities consisted of the following as of December 31 (in thousands): 

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NNN's real estate is generally leased to tenants on a net lease basis, whereby the tenant is responsible for all operating expenses relating to the property, including property taxes, insurance, maintenance, repairs and capital expenditures. The leases are accounted for using either the operating or the direct financing method. Such methods are described below: 

Operating method  – Properties with leases accounted for using the operating method are recorded at the cost of the real estate. Revenue is recognized as rentals are earned and expenses (including depreciation) are charged to operations as incurred. Buildings are depreciated on the straight-line method over their estimated useful lives. Leasehold interests are amortized on the straight-line method over the terms of their respective leases. When scheduled rentals vary during the lease term, income is recognized on a straight-line basis so as to produce a constant periodic rent over the term of the lease. Accrued rental income is the aggregate difference between the scheduled rents which vary during the lease term and the income recognized on a straight-line basis. 

Direct financing method  – Properties with leases accounted for using the direct financing method are recorded at their net investment (which at the inception of the lease generally represents the cost of the property). Unearned income is deferred and amortized into income over the lease terms so as to produce a constant periodic rate of return on NNN’s net investment in the leases. 

Real Estate – Held For Sale – Real estate held for sale is not depreciated and is recorded at the lower of cost or fair value less cost to sell. In accordance with the FASB guidance included in Real Estate , NNN classifies its real estate held for sale as discontinued operations for each property in which rental revenues are generated. 

Impairment – Real Estate – Based upon events or changes in certain circumstances, management periodically assesses its Property Portfolio for possible impairment indicating that the carrying value of the asset, including accrued rental income, may not be recoverable through operations. Events or circumstances that may occur include significant changes in real estate market conditions and the ability of NNN to re-lease or sell properties that are currently vacant or become vacant. Management evaluates whether an impairment in value has occurred by comparing the estimated future cash flows (undiscounted and without interest charges), including the residual value of the real estate, with the carrying cost of the individual asset. If an impairment is indicated, a loss will be recorded for the amount by which the carrying value of the asset exceeds its fair value. 

Real Estate Dispositions – When real estate is disposed of, the related cost, accumulated depreciation or amortization and any accrued rental income for operating leases and the net investment for direct financing leases are removed from the accounts, and gains and losses from the dispositions are reflected in income. Gains from the disposition of real estate are generally recognized using the full accrual method in accordance with the FASB guidance included in Real Estate Sales , provided that various criteria relating to the terms of the sale and any subsequent involvement by NNN with the real estate sold are met. Lease termination fees are recognized when the related leases are cancelled and NNN no longer has a continuing obligation to provide services to the former tenants. 

Valuation of Mortgages, Notes and Accrued Interest – The reserve allowance related to the mortgages, notes and accrued interest is NNN’s best estimate of the amount of probable credit losses. The reserve allowance is determined on an individual 

