The collection consists primarily of New York State Urban Development Corporation (UDC) reports and proposals. The bulk of the material dates from 1967 to 1974, however, there is some material that pre and postdates this period. The collection also contains some reports created by entities outside the UDC such as the New York City Planning Committee and various other NYC urban development community programs. The collection is arranged chronologically.

Correspondence, minutes, reports, documents, scrapbooks, publications, memorabilia, and photographs. The general files, minutes, and reports reflect the varied activities and interests of the League, including apportionment, court reform, education, and voting rights. The historical files contain photographs, printed materials, and memorabilia, filed chronologically. Also included are the periodicals and publications of the League, scrapbooks arranged chronologically, and "Mailbooks", or volumes of mimeographed reports and announcements which were sent to branches and board members. Among the major correspondentrs are: Thomas E. Dewey, Herbert H. Hehman, Nelson A. Rockefeller, Franklin D. Roosevelt, and Alfred Smith