semi-detached dwelling means a building divided vertically into two dwelling units each of which has a separate entrance and access to grade;
Detached building means any building which is not physically connected to the dwelling.
single detached dwelling means a completely detached Building containing only one Dwelling Unit;
single detached dwelling unit means a residential building consisting of one dwelling unit and not attached to another structure;
Dwelling means any building, structure, or portion thereof which is occupied as, or designed or intended for occupancy as, a residence by one or more families, and any vacant land which is offered for sale or lease for the construction or location thereon of any such building, structure, or portion thereof.