No building or structure shall be erected, converted, enlarged, reconstructed or structurally altered, nor shall any building or land be used, for any purpose other than that which is permitted in the district in which the building or land is located.

No building or structure shall be erected, converted, enlarged, reconstructed or structurally altered to exceed the height limit herein established for the district in which the building is located.

No building or structure shall be erected, converted, enlarged, reconstructed or structurally altered except in conformity with the area regulations of the district in which the building is located.

No space which, for the purpose of a building or dwelling group, has been counted or calculated as part of a side yard, rear yard, front yard, court or other open space required by this chapter may, by reason of change in ownership or otherwise, be counted or calculated to satisfy or comply with a yard, court or other open space requirement of or for any other building.

The minimum yards or other open spaces, including lot areas per family required by this chapter for each and every building existing at the time of passage of this chapter or for any building hereafter erected, shall not be encroached upon or considered as yard or open space requirements for any other building.