Any sponsoring authority may request specifications from the Department for the establishment of specialized living centers. Upon receipt of such specifications from the Department a sponsoring authority may develop a detailed proposal for the establishment of a specialized living center for the person with a developmental disability. Such detailed proposal shall include the selection of a specific site for the location of a specialized living center and shall take into account and shall be based upon the specifications developed by the Department. A sponsoring authority shall have 90 days after receipt of specifications from the Department to develop a detailed proposal. After the expiration of such 90 day period the Department may, at its option, refuse to accept the submission of such proposal.