Required rear yard equivalents
R1 R2 R3 R4 R5 R6 R7 R8 R9 R10
In all districts, as indicated, on any through lot 110 feet or more in maximum depth from street to street, one of the following rear yard equivalents shall be provided:
(a) an open area with a minimum depth of 60 feet midway (or within five feet of being midway) between the two street lines upon which such through lot fronts;
(b) two open areas, each adjoining and extending along the full length of a street line, and each with a minimum depth of 30 feet measured from such street line, except the depth of such required open area along one street line may be decreased, provided that:
(1) a corresponding increase in the depth of the open area along the other street line is made; and
(2) any required front setback areas are maintained; or
(c) an open area adjoining and extending along the full length of each side lot line, with a minimum width of 30 feet measured from each such side lot line.
However, in R5D, R6A, R6B, R7A, R7B, R7D, R7X, R8A, R8B, R8X, R9A, R9D, R9X, R10A and R10X Districts, and for Quality Housing buildings in other R6 through R10 Districts, on any through lot at least 180 feet in depth from street to street, a rear yard equivalent shall be provided only as set forth in paragraph (a) of this Section.
Any such rear yard equivalent shall be unobstructed from its lowest level to the sky, except as provided in Section 24-33 (Permitted Obstructions in Required Yards or Rear Yard Equivalents).