(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-5" Residential Districts subject to all qualifications imposed on such uses;

(b) Attached single-family dwellings in groups of not more than ten; provided, that each dwelling shall be not less than eighteen feet in width.

(2) Area Regulations.

(a) Lot Width and Area. The minimum lot width shall be eighteen feet and the minimum lot area shall be one thousand six hundred twenty square feet; provided, that the minimum lot width of the end dwelling of a permissible group shall be thirty feet, and the minimum lot area of the end dwelling shall be two thousand seven hundred square feet.

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

(c) Open Area. The open area shall not be less than fifty percent of the lot area and shall consist of at least the minimum front and rear yards in all cases, plus such other side yards or open courts, as shall be required to equal an area not less than the total area required.

(d) Building Set-back Line. The building set-back line shall be fifteen 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 set-back line, as herein specified.

(f) Side Yards. When side yards are used, they shall have the following minimum widths:

(.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; provided, that every such dwelling located on a corner lot shall have the building set-back on the intersecting street adjudged a side yard (which shall be not less than the set-back required), and the other or inside yard shall be not less than six feet wide (subject to exception for existing buildings, see Section 14-104(12)).

(.2) Every semi-detached dwelling shall have a side yard not less than eight (8) feet wide; provided, that such a dwelling located on a corner lot shall have the building set-back on the intersecting street adjudged a side yard (which shall be not less than the set-back required).

(.3) Every attached dwelling which is the end unit of a permissible group shall have a side yard with a minimum average width of twelve (12) feet; provided, however, that no portion of said yard shall be less than eight feet in width; and provided further, that such a dwelling located on a corner lot shall have the building set-back on the intersecting street adjudged a side yard (which shall be not less than the set-back required).

(g) Courts.

(.1) Open courts not between wings of the same building shall be the same minimum width required for side yards, except in the case of attached dwellings, which shall have a required minimum width of five feet (subject to exception for existing buildings, see Section 14-104(12)).

(.2) Open courts between wings of the same building and inner courts shall be governed by the provisions of Section 14-231(1).

(h) Rear Yards.The minimum depth of a rear yard shall be twenty feet.

(3) Height Regulations.

(a) The maximum height of a dwelling shall be thirty-five 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 thirty-five 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, the maximum height of any such building be sixty feet (subject to provisions of Section 14-231(2)).

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