(1) making inventories of existing facilities, surveying the need for construction of facilities for the mentally retarded and community mental health centers, and developing programs of construction as provided in subchapter II of this chapter, and
(2) developing and administering a State plan for the construction of public and other nonprofit facilities for the mentally retarded, and a State plan for the construction of public and other nonprofit community mental health centers, as provided in subchapter II of this chapter.