The following words when used in this article shall have the meanings ascribed to them in this section except where the context clearly indicates or requires a different meaning:
The act of effecting a change in the occupancy of any residence, or place of business, or the act of occupying a formerly vacant residence or place of business or the act of rendering a residence or place of business vacant.
Any natural person, partnership, association, firm or corporation.
Any building or portion thereof used or useful for the purpose of housing any business, trade or other commercial activity, or for the purpose of housing any business office, professional office or other similar activity.
Any house, mobile home, apartment or other dwelling unit designed for the use of one or more persons as a place of abode, excluding hotel rooms, motel units and other similar accommodations for transient persons.