definiens: means, for each Fiscal Year or other period, mean s an amount equal to the depreciation, amortization or other cost recovery d eduction allowable with respect to an asset for tha t year or other period, except that if the Gross Asset Value of an asset differs from its adjusted basis for fed eral income tax purposes at the beginning of the Fiscal Year or other period, Depreciation shall be an amount whic h bears the same ratio to that different Gross Asset Value ( as originally computed ) as the federal income tax depreciation, amortization, or other cost recovery deduction for that Fiscal Year or other period bear s to the adjusted tax basis ( as originally computed ) ; provid ed, however, that if the federal income tax depreci ation, amortization or other cost recovery deduction for t he applicable year or period is zero, Depreciation shall be determined with reference to the Gross Asset Value ( as originally computed ) using any reasonable metho d selected by the Board of Managers in good faith