In this Part "social housing" means—
low cost rental accommodation (defined by section 69), and
low cost home ownership accommodation (defined by section 70).
Accommodation which becomes "social housing" by satisfying subsection (1)(a) or (b) remains "social housing" for the purposes of this Part unless and until an event specified in sections 73 to 76 occurs.
Section 77 makes transitional provision as a result of which certain accommodation is to be treated as "social housing" whether or not it satisfies subsection (1)(a) or (b).