Except as hereinafter provided in this chapter:
(a) BUILDINGS.
(1) No building shall be erected and no existing building shall be moved, altered, added to or enlarged, nor shall any land or building be designed, used or intended to be used for any purpose or in any manner other than as specified among the uses hereinafter listed as permitted in the district in which such building or land is located.
(2) No building shall be erected, reconstructed or structurally altered to exceed in height the limit hereinafter designated for the district in which such building is located.
(3) No building shall be erected, no existing buildings altered, enlarged or rebuilt, nor shall any open space surrounding any building be encroached upon or reduced in any manner, except in conformity to the yard, lot area and building location regulations hereinafter designated for the district in which such building or open space is located.
(4) Each principal building shall front on a duly accepted public street which has been improved in accordance with City standards or on streets in the process of being improved in accordance with final plat requirements of the Subdivision Regulations.
(b) REQUIRED AREA OR SPACE CANNOT BE REDUCED. The area or dimension of any zone lot, yard, parking area or other space shall not be reduced to less than the minimum required by this Zoning Ordinance, and if already less than the minimum required by this Zoning Ordinance, such area or dimension may be continued and shall not be further reduced.
(c) MAXIMUM COVERAGE REQUIREMENTS. Land coverage by principal and accessory buildings or structures on each zone lot shall not be greater than is permitted in the district where such principal and accessory buildings are located.
(d) OFF-STREET PARKING REQUIREMENTS. No off-street parking or loading space shall be so reduced in area that it does not meet the minimum requirements of this chapter.
(e) INTERPRETATION OF REQUIREMENTS AS MINIMUM STANDARD. Within each district, the regulations set forth by this chapter shall be considered minimum regulations and shall apply uniformly to each kind of building, structure or land and use thereof.