The NYC Landmarks50 Alliance is comprised of individuals and organizations committed to informing and educating the public about historic preservation in New York City. On April 19, 1965, Mayor Robert Wagner signed New York City’s Landmarks Law, and the new era of historic preservation began.

The NYC Landmarks50 Alliance has been formed to create an appropriate commemoration of the 50th Anniversary of the New York City's Landmarks Law in 2015, and to ensure that the preservation community, as well as the wider New York City public, reflect upon and embrace the significance of the role of historic preservation in shaping the City. The goal of this project is to broaden the appreciation of, and commitment to New York City's admired architecture, and to develop a new audience and a new generation of future preservationists, who will take responsibility for protecting the continuity of the New York Cityscape.