In a Residence C District, no building or premises shall be used and no building shall be erected or altered for other than one or more of the following specified uses:

The building area shall not exceed 30% of the lot area.

There shall be a required front yard which shall be not less than 20 feet in depth.

There shall be two side yards, one on each side of the main building. Each side yard shall not be less than six feet wide.

There shall be a required rear yard which shall have a minimum depth of 25 feet.

No principal building and accessory buildings shall be erected upon a lot that has street frontage and minimum lot width at the front and rear wall of the principal building of less than 40 feet and a lot area of less than 4,000 square feet.

No building shall be greater than 2 1/2 stories nor more than 35 feet in height.