"Person" includes a firm, association, organization, partnership, trust, company or corporation, as well as an individual. The present tense includes the future tense, the singular number includes the plural and the plural number includes the singular. "Shall" is mandatory and "may" is permissive. "Used" or "occupied" includes the words "intended", "designed" or "arranged to be used or occupied". "Lot" includes "plot" or "parcel".