Principal residence
(3) Principal residence. If a principal residence consisting of two or more elements is disposed of, and if for purposes of computing applicable percentage the holding period of the principal residence acquired includes the holding period of the principal residence disposed of by reason of the application of paragraph (d) of 1.1250-4, then the additional depreciation (or a deficit in additional depreciation) for an element of the principal residence acquired immediately after the transaction shall be determined in a manner consistent with the principles of subparagraph (1) of this paragraph. For purposes of computing applicable percentage, the holding period for an element of the principal residence acquired includes the holding period of such element of the principal residence disposed of, but not the period beginning on the day after the date of the disposition and ending on the date of the acquisition.