(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) Detached, semi-detached or attached multiple dwellings;

(b) Private dwelling garage as an accessory use;

(c) Accessory uses, as defined;

(d) Non-residential uses permitted in "R-14" Residential Districts, subject to all qualifications imposed on such uses;

(e) Signs, to the extent permitted in "R-2" Residential Districts.

(2) Area Regulations.

(a) Lot Width and Area. The minimum lot width shall be 50 feet, and the minimum lot area shall be 5,000 square feet.

(b) Occupied Area. Not more than 70% of the lot area shall be occupied by buildings on intermediate lots and 80% of the lot area on corner lots.

(c) Open Area. The open area shall be not less than 30% of the lot on intermediate lots, and 20% on corner lots, and may consist of front, side or rear yards and open courts. Any open area used shall comply with the minimum dimensions specified in (d), (e) and (f) of this section.

(d) Building Set-back Line. No building set-back line shall be required in this district, subject to the provisions of (e)(.1) below.

(e) Yards. The front, side and rear yards in this district shall be defined as the open area created on the lot by the following requirements:

(.1) Any wall of a structure containing one or more legally required windows shall be located so that every point of said wall shall be a minimum horizontal distance from the lot line equal to one-half the height of said point above the average ground level at the base of the structure; provided, that where said wall faces upon a street, said distance may be measured from the centerline of said street rather than the lot line, and, provided further, that a side yard if used, shall be at least five feet in width, and a rear yard if used shall be not less than 15 feet in depth.

(f) Courts. Courts, when used, shall have minimum widths as follows:

(.1) The minimum width of open courts not between wings of the same building shall be not less than five feet;

(.2) The minimum width of courts between wings of the same structure shall be determined by the following requirements:

(.a) For buildings of three stories or less and not in excess of thirty-five feet high, the minimum width shall be not less than the length or depth of such court.

(.b) For buildings over three stories or over thirty-five feet in height, whichever is less, the minimum width shall be not less than the length or depth of such court plus one-third of that portion of the height of the building over three stories or thirty-five feet.

(.3) The dimensions of an inner court shall be equal to the height of the higher wall between which each dimension of the inner court is being measured.

(3) Height Regulations. There shall be no height regulations except as height may be limited by the other applicable provisions of this district.

(4) Floor Area. No building in this district shall have a gross floor area (as defined in § 14-102(25)) greater than that permitted under the provisions herein set forth:

(a) Basic Floor Area. Every building in this district shall be permitted a gross floor area equal to 350% of the area of the lot.

(b) Additional Floor Area. In addition to the Basic Floor Area, any building in this district shall be permitted additional gross floor area in accordance with the following provisions, which shall be cumulative in their effect:

(.1) Buildings Constructed Back from Streets Fifty Feet or More in Width: Where a building or any portion thereof is constructed back, at ground level, at least 10 feet from the street line of any street of 50 feet or more in width, there shall be permitted four square feet of additional gross floor area for each square foot between the street line and the building (including areas of yards); provided, that the foregoing shall not apply to any area which lies further from the street line than 50% of the depth of the lot;

(.2) Buildings Constructed Back from Streets Less than Fifty Feet in Width: Where a building or any portion thereof is constructed back, at ground level, at least 10 feet from the street line of any street of less than 50 feet in width, there shall be permitted two square feet of additional gross floor area for each square foot between the street line and the building (including areas of yards); provided, that the foregoing shall not apply to any area which lies further from the street line than 50% of the depth of the lot;
(.3) Buildings Constructed Away from a Rear Lot Line, Not a Street Line: Where a building or any portion thereof is constructed away, at ground level, from a rear lot line which is not a street line, there shall be permitted one square foot of additional gross floor area for each square foot between the rear lot line and the building (including areas of yards); provided, that the foregoing shall not apply to any area which lies further from the rear lot line than 50% of the depth of the lot;

(.4) Buildings Constructed With Open Arcades: Where a building or any portion thereof is constructed so that at the ground level there is an open arcade of at least 10 feet in unobstructed width which abuts a sidewalk and is open to public use at all times, there shall be permitted 0.3 square feet of additional gross floor area for each square foot in said arcade; provided, that this subparagraph shall also apply to buildings cantilevered to produce an effect similar to an arcade at least 10 feet in unobstructed width;

(.5) Open Areas Separated from a Street Line by an Open Arcade: Where a building or any portion thereof is constructed back, at ground level, at least 15 feet from a street line, to create a continuous open area which is separated from the street line only by an open arcade, there shall be permitted 4 square feet of additional gross floor area for each square foot of such open area where said street line is of a street which is 50 feet or more in width, or 2 square feet of additional gross floor area for each square foot of such open area where said street line is of a street which is less than 50 feet in width, subject to the following provisions:

(.a) The foregoing shall not apply to any area which lies further from the street line than 50% of the depth of the lot;

(.b) "Continuous open area" as used in this subparagraph shall mean an open area which is unobstructed (except for passage through the open arcade) in a straight line from the building to the street line;

(.c) The additional gross floor area permitted for the area within said open arcade itself shall in all cases be governed by subparagraph (.4) above;

(.6) Other Open Areas Provided at Ground Level: Where a building or any portion thereof is constructed so as to provide open areas at ground level other than those described in subparagraphs (.1) through (.5) above, there shall be permitted 0.6 square feet of additional gross floor area for each square foot of said open area;

(.7) Buildings Constructed Away from any Lot Line at First or Second Story Roof Level: Where a building or any portion thereof is constructed away from any lot line (whether or not said lot line is also a street line) above ground level, but not beyond the second story roof level, there shall be permitted 0.5 square feet of additional gross floor area for each square foot between the lot line and the buildings; provided, that where a building or any portion thereof is constructed away from a lot line at successive distances at different levels, the computation of permitted additional gross floor area shall be made for each level, beginning at the ground level, and not including, in each case, areas between the building and the lot line which have already been used in computing permitted additional gross floor area at another level;

(.8) Areas Used or Intended to be Used for Parking: Any area used or intended to be used for parking purposes shall not be included as permitting additional gross floor area under the provisions of subparagraphs (.4) and (.5) above.

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