In districts “A,” “B,” “B-1,” “B-2,” “C,” and in all other districts where a building is erected or structurally altered for dwelling purposes there shall be two (2) side yards, one on each side of the building having combined width of not less than twenty (20) percent of the width of the lot, provided that in no case shall either side yard be less than five (5) feet, and provided further that the combined widths of the two (2) side yards need not exceed twelve (12) feet. In the “D” district where a building is erected or structurally altered for dwelling purposes, said building shall have side yards of not less than ten (10) feet from the property line and they shall have a back yard of not less than five (5) feet from the property line.

In the “C” district and in the other districts where a building is erected or structurally altered for dwelling purposes for building more than three (3) stories in height, but not exceeding six (6) stories in height, each of the two (2) side yards shall be increased three (3) feet in width for each additional story above the third. For buildings more than eight (8) stories, or one hundred (100) feet in height, there shall be an additional set-back as provided in the height regulations above.

In the “D,” “E,” “F,” “G,” “H” and “I” districts if the property is not used for dwelling purposes no side yards are required, unless a lot abuts upon the side of a lot zoned for dwelling purposes, there shall be a side yard, if provided for a business or industrial building, shall not be less than four (4) feet.

For the purpose of side yard regulations, two (2) or more detached one- or two-family dwellings shall be considered as one building when occupying one lot, provided, however, there shall be a minimum of ten (10) feet between the sides of the building on the same lot.

In the case of group houses or court apartments, when buildings rear upon the side yard, the width of the said yard shall be increased by one foot for each building or apartment abutting thereon. If any stairways open onto or are served by such side yard, the minimum width of such side yard shall be ten (10) feet.

The width of a place or court shall not be less than forty (40) feet measured between buildings or from buildings to the opposite property line, provided that open or unenclosed porches may project into the required place or court not more than twenty (20) percent of the width of such place or court.

All other requirements including front, side and rear yards shall be complied with in accordance with the district in which such group houses or court apartments are located.

Every part of a required yard or court shall be open from its lowest point to the sky unobstructed except for the ordinary projections of sills, belt courses, cornices; provided, however, the above projections shall not extend into a court more than twenty-four (24) inches nor into a minimum side yard more than twenty-four (24) inches.

The side and front yard requirements for dwellings shall be waived where dwellings are erected above stores or shops.

On corner lots the side yard regulations shall be the same as for interior except in the case of side street or reversed frontage (where the corner lot faces an intersecting street) in which case there shall also be a side yard on the street side equal to the front yard on the lots in the rear. No accessory building on said corner lot shall project beyond the front yard line on the lots in the rear. This regulation shall not be so interpreted as to reduce the buildable width of a corner lot facing an intersection street, and of record at the time of passage of this ordinance to less than twenty-eight (28) feet, nor to prohibit the erection of an accessory building where the regulation cannot reasonably be complied with. In no event shall there be a corner lot with a building situated thereon which is closer than ten (10) feet to either street.