In order to provide adequate open space for access of light and circulation of air, to facilitate the prevention and fighting of fires, to prevent undue concentration of population and to lessen congestion on streets, no building or premises shall be erected, altered or used except in accordance with the standards set forth in this article.

The attached schedule of density control regulations is hereby adopted and declared to be a part of this chapter and is hereinafter referred to as the "Density Control Schedule."[1]

Wherever a side or rear yard is adjacent to a street, the standards for front yards shall apply.

District building height regulations shall not apply to flagpoles, radio or television antennas, transmission towers or cables, spires or cupolas, chimneys, elevator or stair bulkheads, penthouses, parapets or railings, water tanks or cooling towers or any similar structures, provided that such structures in their aggregate coverage occupy no more than 10% of the roof area of the building.

Side yards for semidetached and attached dwellings shall be required at ends of the total structure only.

No detached principal building shall be closer to any other principal building on the same lot than the average heights of said buildings.