(a) “Owner” means any person, co-partnership, association, corporation or fiduciary having legal, or equitable title, or any interest in any real property. Whenever used in any clause, prescribing or imposing a penalty, the term owner, as applied to co-partnerships and associations, shall mean the partners, or members thereof, and as applied to corporations, the officers thereof.

(b) “Property” means any building or structure situate in any city of the first class or situate in any city of the second class, or situate in any other municipality eligible and electing to adopt the provisions of this act, except buildings or structures used, designed or intended to be used, exclusively, for single family or two-family occupancy, churches or other places of religious worship, except that for the purpose of certification or statements regarding notices of housing, building, safety or fire violations, the word “property” shall include all buildings or structures.

(c) “Agreement of sale” means any agreement, or written instrument, which provides that title to any property shall thereafter be transferred from one owner to another owner, and shall include inter alia written leases which contain options to purchase the leased property, and leases which provide that the lessee of the property shall acquire title thereto after the payment of a stipulated number of regular rent payments or after a stipulated period of time.