Upon application by a person, firm or corporation which has secured site plan approval, if required, and upon proof of undue hardship, expense and delay occasioned by such conditions as weather, unavailability of material due to strikes, rationing or lack of transportation and where structures are erected upon the site and the site has been sufficiently improved to support limited commercial operation of the developed site other than a site for multiple residential use, but in no event when less than 75% completed, the Township Committee may, in its discretion, direct the Zoning Officer or Building Inspector of the Township to issue a temporary certificate of occupancy for a period not to exceed 180 days to permit the applicant to make such limited use of the improved site as shall be set forth in a resolution of the Township Committee. The Township Committee shall impose such conditions as it shall determine to be necessary to be imposed upon such limited use, including but not limited to the provision for the imposition of penalties for failure to complete the site development in accordance with site plan approval and the provision as to when the applicant shall obtain final inspection and approval of the development site. Such limited use may be permitted, notwithstanding that all required improvements may not have been installed at the time the application is made for a temporary certificate of occupancy.