(7)   Designation of Public Interior Portions of Buildings.
(a)   No public interior portion of a building or structure shall be considered designated for preservation pursuant to this Chapter 14-1000 or § 14-2007 of the prior zoning ordinance unless it has been specifically designated after December 28, 2009.
(b)   A public interior portion, or any part of a public interior portion, of a building or structure may be designated for preservation regardless whether the remainder of the building, structure, site or appurtenances with which it is associated has been so designated.
(c)   The designation of a building, structure, or district shall not constitute designation of any public interior portion of such building, structure or a building or structure in such district, unless the public interior portion is specifically identified in such designation.