No structure, or part thereof, shall hereafter be built, moved, or enlarged and no structure or land shall hereafter be used, occupied or arranged, or designed for use of occupancy on a lot which is:
1. Smaller in area than the minimum area, or minimum lot area per dwelling unit, required in the zoning district in which the structure or land is located;
2. Narrower than the minimum lot width required in the zoning district in which the structure or land is located; or
3. Shallower than the minimum lot depth required in the zoning district in which the structure or land is located.
No existing structure shall hereafter be remodeled as to conflict or further conflict, with the lot area per dwelling unit requirements for the zoning district in which the structure is located.