Apartment or apartments over any of the uses permitted in this section; provided, however, that the off-street parking requirements shall be as specified in § 405-1703A(1) and (6); and provided, further, that in the case of alterations to an existing building for such combined use, the front yard, side yard and rear yard areas shall be reduced to less than those existing on the lot in question prior to the conversion, except that they need not be greater than those provided in Subsection H above. In the case of a new building with such combined uses, the front yard, side yard and rear yard areas shall be as provided for in Subsection H of this section.