[Amended 12-10-1990 by L.L. No. 13-1990]
No single-family detached or semidetached dwelling shall hereafter be erected unless it shall have a minimum floor area of 1,500 square feet. For the purpose of this section, the term "floor area" shall be that area enclosed within the outside walls of the principal building, excluding cellar, basement, attic, unenclosed porches, terraces and steps, garages and rooms for heating and ventilating equipment. To qualify as floor area for the purposes of this section, the second or attic floor shall have or permit a structural headroom of at least seven feet six inches in respect of so much of the floor area as shall be deemed so qualified, and full flooring shall be laid thereon, and such floor area to so qualify shall also have access from the floor below by a permanent built-in stairway.