N.Y.C. Admin. Code § 5-344: § 5-344 Amendment of improvement proceeding to include or exclude excess lands.

After the institution of a proceeding for an improvement, the mayor may amend the proceeding by authorizing the acquisition of lands additional to those required for the improvement, provided that title shall not have vested in the city to any parcel of real property to be acquired for the improvement within the block, between legally existing public streets, embracing the additional lands sought to be acquired. The mayor may also amend any proceeding so as to exclude any or all additional lands being acquired in the proceeding, provided title to such additional lands shall not have vested in the city. Thereafter the proceeding shall be conducted in the same manner as if the additional lands included or excluded by the amendment had been included or had not been included in the proceeding at the time of the institution thereof.