Renewal period
(2) Renewal period. (i) For purposes of this paragraph, the term renewal period means any period for which the lease may be renewed, extended, or continued pursuant to an option or options exercisable by the lessee (whether or not specifically provided for in the lease) except that the inclusion of one or more renewal periods shall not extend the period taken into account by more than two-thirds of the period on the basis of which the depreciation adjustments were allowed. (ii) In respect of the cost of any building erected (or other improvement made) on the leased property by the lessee, or in respect of the portion of the cost of acquiring a leasehold which is attributable to an existing building (or other improvement) on the leasehold at the time the lessee acquires the leasehold, the inclusion of one or more renewal periods shall not extend the period taken into account to a period which exceeds the useful life remaining, at the time the leasehold is disposed of, of such building (or such other improvement). Determinations under this subdivision shall be made without regard to the proper period under section 167 or 178 for depreciating or amortizing a leasehold acquisition cost or improvement. (iii) The provisions of this subparagraph may be illustrated by the following example: