(1) Use Regulations. The specific uses permitted in this district shall be the erection, construction, alteration, or use of buildings and/or land for:

(a) The uses permitted in "R-4" Residential Districts, subject to all qualifications imposed on such uses;
(b) Detached and semi-detached duplex dwellings.

(2) Area Regulations.

(a) Lot Width and Area. The minimum lot width shall be 25 feet, and the minimum lot area shall be 2,250 square feet.

(b) Occupied Area. Not more than 50% of the lot area shall be occupied by buildings.

(c) Open Area. The open area shall be not less than 50% of the lot area and shall consist of front, side and rear yards of at least the minimum dimensions herein designated.

(d) Building Set-back Line. The building set-back line shall be eight feet from all street lines.

(e) Front Yards. The minimum depth of a front yard shall be the depth required between the street line and the building setback line, as herein specified.

(f) Side Yards.

(.1) Every detached dwelling and every building other than a dwelling shall have two side yards, neither of which shall be less than eight feet wide (subject to exception for existing buildings, see § 14-104(12)).

(.2) Every semi-detached dwelling shall have a side yard not less than eight feet wide.

(g) Courts. Courts when used shall be in addition to the open area required. The minimum widths of courts shall be the same as the minimum widths required for side yards, except inner courts and open courts between wings of the same building, which are governed by the provisions of § 14-231(1).

(h) Rear Yards.

(.1) The minimum depth of a rear yard shall be 15 feet for a single- family dwelling;

(.2) The minimum depth of a rear yard shall be 20 feet for a duplex dwelling;

(.3) The minimum depth of a rear yard for any building other than a dwelling shall be 20 feet.

(3) Height Regulations.

(a) The maximum height of a dwelling shall be 35 feet above the average ground level at the base of the building, but in no case over three stories.

(b) The permitted height of non-residential buildings shall be 35 feet, except that one foot of additional height may be added for each additional foot the building sets back from all lot lines; provided, however, that the maximum height of any such building shall be 60 feet (subject to the provisions of § 14-231(2)).

(4) Off-street Parking. See § 14-1400 of this Title.