project area acquired or to be acquired and redeveloped or rehabilitated by such educational institution for educational uses or by such hospital for hospital uses. Such plans may comply with all requirements of federal legislation as they may exist from time to time relating to noncash grant-in-aid credits for expenditures of such hospitals or educational institutions. After its approval by the urban renewal agency, as aforesaid, any development plan which is not part of an urban renewal plan shall be approved by the planning board, the municipal officers and the department in the same manner as urban renewal plans, except that no further public hearing shall be required.