The Council is satisfied that permanent housing facilities will be available within three years from the time occupants of the project area are displaced, if any, and that pending the development of such facilities, there will be available to any such displaced occupants temporary housing facilities at rents comparable to those in the City at the time of their displacement. No persons or families of low and moderate income shall be displaced from residences unless and until there is a suitable housing unit available and ready for occupancy by such displaced persons or families at rents comparable to those at the time of their displacement. Such housing units shall be suitable to the needs of such displaced persons or families and must be decent, safe, sanitary and otherwise standard dwellings. The Agency shall not displace any such persons or families until such housing units are available and ready for occupancy.