(1)  Subject to subsection (2) , the common property consists of –

(a) parts of a site (including buildings or parts of buildings and improvements) that are not within a lot; and

(b) the service infrastructure.

(2)  A part of the service infrastructure within a lot, and solely related to supplying services to the lot, is common property only if it is within a boundary structure separating the lot from another lot or from common property.