Yard required for each building. No part of the yard or open space required for a given building shall be included as part of the yard or other space required for another building.

Projections into yards. Every part of a required yard shall be open to the sky unobstructed, except for accessory buildings and the ordinary projections of sills, cornices and ornamental features projecting not more than 48 inches, except that in commercial areas, a permanent awning and its accessory columns or struts may project not more than six feet into a required front or side yard.

Fire escapes. Open or enclosed fire escapes may project into a required yard not more than five feet and into a required court not more than 3 1/2 feet, provided it be so located as not to obstruct light or ventilation.

Yards in commercial and industrial districts. No side yard or front yard in any Commercial or Industrial District shall be used for storage or the conduct of business.

Accessory buildings. Detached garages shall not exceed 1,200 square feet in area, nor exceed 15 feet in height. Only one detached garage may be constructed on a single lot or parcel. In addition, one garden shed not more than 120 square feet and 15 feet in height may be constructed on a single lot or parcel. Any accessory building projected forward of the rear building line shall be deemed part of the principal building for front and side yard setback requirements.