No building, structure or land shall hereafter be used or occupied and no building or structure or part thereof shall hereafter be erected, constructed, reconstructed, moved or structurally altered unless in conformity with all of the regulations herein specified for the district in which it is located.

No building or other structure shall hereafter be altered to exceed the height, to accommodate or house a greater number of families, to occupy a greater percentage of lot area, or to have narrower or smaller rear yards, front yards, side yards or other open spaces than herein required or in any other manner contrary to the provisions of this chapter.

No part of a yard or other open space or off-street parking or loading space required about or in connection with any building for the purpose of complying with this chapter shall be included as part of a yard, open space or off-street parking or loading space similarly required for any other building.

No yard or lot existing at the time of passage of this chapter shall be reduced in dimension or area below the minimum requirements set forth herein. Yards or lots created after the effective date of this chapter shall meet at least the minimum requirements established by this chapter.