N.Y. Gen. Mun. Law § 501
There exist in many municipalities within this state residential, non-residential, commercial, industrial or vacant areas, and combinations thereof, which are slum or blighted, or which are becoming slum or blighted areas because of substandard, insanitary, deteriorated or deteriorating conditions, factors, and characteristics, with or without tangible physical blight. The existence of such areas constitutes a serious and growing menace, is injurious to the public safety, health, morals and welfare, contributes increasingly to the spread of crime, juvenile delinquency and disease, necessitates excessive and disproportionate expenditures of public funds for all forms of public service and constitutes a negative influence on adjacent properties impairing their economic soundness and stability, thereby threatening the source of public revenues.
In order to protect and promote the safety, health, morals and welfare of the people of the state and to promote the sound growth and development of our municipalities, it is necessary to correct such substandard, insanitary, blighted, deteriorated or deteriorating conditions, factors and characteristics by the clearance, replanning, reconstruction, redevelopment, rehabilitation, restoration or conservation of such areas, the undertaking of public and private improvement programs related thereto and the encouragement of participation in these programs by private enterprise.
It is necessary for the accomplishment of such purposes to grant municipalities of this state the rights and powers provided in this article. The use of such rights and powers to correct such conditions, factors and characteristics and to eliminate or prevent the development and spread of deterioration and blight through the clearance, replanning, reconstruction, rehabilitation, conservation or renewal of such areas, for residential, commercial, industrial, community, public and other uses is a public use and public purpose essential to the public interest, and for which public funds may be expended.
N.Y. Gen. Mun. Law § 501