§ 255-19.   Conversion requirements.
The Zoning Hearing Board may allow as a the conversion of a single-family into a for a greater number of , subject to the following requirements:
   A.   A petition in favor of such exception is filed with the Zoning Hearing Board signed by the owners of 60% or more of the frontage on the same within 1,000 feet of the designated .
   B.   Each shall not have less than 500 square feet of floor area.
   C.   The per is not reduced thereby to an amount less than 75% of that required by this chapter for the district in which the designated is located.
   D.   The and requirements for the district in which the is located shall not be reduced.
   E.   There is no external alteration of the building except as may be necessary for reasons of safety. Fire escapes and outside stairways shall, where practicable, be located to the rear of the .
   F.   The Zoning Hearing Board shall specify the maximum number of permitted to occupy such and may prescribe such further conditions and restrictions as the Board may consider appropriate.
   G.   The off-street parking requirements of this chapter are met.
   H.   The conversion shall be authorized only for a large with relatively little economic usefulness as a conforming .