89.— In this Chapter—

F64 [ “ dwelling ” means a dwelling provided by a housing authority under this Act of which they are the owner and includes any shop, outoffice, yard, garden or other land appurtenant thereto or usually enjoyed therewith; ]

F65 [ “ purchase money ” , in relation to a dwelling, means —

( a ) the purchase price of the dwelling after taking into account any reduction in the price as a result of any discount or other allowance made by the housing authority concerned, and

( b ) any interest payable on the amount determined in accordance with paragraph ( a ) of this definition;

“ purchaser ” means the person (including a housing authority) to whom a sale is made and includes a successor in title of that person and the personal representative of that person or successor in title;

“ sell ” , in relation to a dwelling, means to sell or exchange a freehold or leasehold estate or interest, and cognate words shall be construed accordingly; ]

“ special condition” means a condition requiring that—

( a) payments in respect of the purchase money shall be made punctually on the due dates,

( b) the dwelling shall, unless the housing authority otherwise allow, be occupied as a normal place of residence by the purchaser or the purchaser's successor in title or by a member of the purchaser's family or the family of his successor in title,

( c) the dwelling or any part thereof shall not, without the consent of the housing authority, be mortgaged, charged or alienated otherwise than by devise or operation of law.