(3) “Housing”, “housing project”, “development” or “project” means any undertaking having as its principal purpose the construction or substantial rehabilitation of safe and adequate housing and related facilities for low and moderate income families and persons, including housing that provides dwelling accommodations in addition to the primary purpose of providing dwelling accommodations for low and moderate income families and persons;
(4) “Related facilities” means retail, commercial, office, health, administrative, recreational, community and service facilities incidental to housing as determined by the authority;
(5) “Rent” means the charges, excluding security deposits, paid to a landlord for occupancy of housing financed or assisted under sections 8-400 to 8-405, inclusive;