(1) In this Part a reference to a unit shall be read as a reference to:
(a) a part of the parcel, being part of a building, bounded by reference to floors, walls and ceilings, or such part of the parcel together with land in the parcel whether or not that land is contiguous to the part;
(b) a part of the parcel, being a part containing a building or part of a building and being unlimited in its vertical dimensions except to the extent of any projection above, or encroachment below, ground level by another part of the parcel, or such a part of the parcel together with land in the parcel which is not contiguous to the part; or
(c) in the case of an estate development, a part of the parcel unlimited in its vertical dimensions.
(2) In this Part a reference to parcel is to be read as including a reference to a building lot.