(27) To encourage home ownership by low and moderate income families and persons, including ownership of structures containing not more than four dwelling units where the eligible low or moderate income family or person owning such structure occupies a dwelling unit therein. Structures acquired hereunder may be newly-built, existing or rehabilitated, either before or after acquisition. If newly-built, such structures shall conform to the State Building Code; existing structures shall conform after rehabilitation to standards established by the authority. The authority may assist an eligible mortgagor in the acquisition, construction or rehabilitation of such structures by exercising any of the powers conferred upon the authority by this chapter. Any structure so acquired, constructed or rehabilitated by an eligible mortgagor other than a low or moderate income family or person shall be conveyed to a low or moderate income family or person within one year from the date of such acquisition or from the date of completion of such construction or acquisition, whichever date is later;