N.Y.C. Admin. Code § 5-346: § 5-346 Petition and notice.

When the mayor shall have authorized the acquisition of additional real property in connection with any improvement, such additional real property shall be separately described in the notice of application to condemn by the supreme court and in the petition presented on any such application, and separately shown on the rule map attached to the petition and on the damage map in the proceeding, and such notice and petition shall state what part of the real property to be condemned is required for the improvement, and what part thereof is to be acquired as additional real property. The acquisition of such additional real property, when authorized by the mayor, shall be deemed to be for a public purpose.