N.Y. Gen. Mun. Law § 691
There exist in many municipalities within this state municipally-owned areas which were acquired pursuant to the urban renewal powers delineated in article fifteen of this chapter or through condemnation for projects now abandoned or as a direct result of previous landowners' failure to meet in full their real estate tax or other obligations or through proceedings relating to abandoned multiple dwellings or which consist of municipal facilities no longer needed for public purposes. These areas are residential, non-residential, commercial, industrial, municipal facilities 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 maintenance 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 provide incentives for the correction of 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 and participation in these programs by private enterprise.
Moreover in order to assure that each segment of our society, particularly enterprises experienced in the construction of one to four family residential structures and business enterprises which are controlled by members of minorities, is accorded a real and proper ability to participate in projects to be undertaken pursuant to this article, it must be the public policy of each municipality operating pursuant to the provisions hereof to take such initiatives as are appropriate to effect such participation.
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 § 691