N.Y. Gen. Mun. Law § 717

§ 717. Boundaries and map of local government to which territory is\nannexed. 1. Within a reasonable time after an annexation pursuant to\nthis article, the governing board of a local government to which\nterritory has been so annexed shall cause (a) a survey to be made of the\nannexed territory, (b) the boundaries of the same to be marked with\nmonuments, and (c) a map to be made of such local government including\nthe annexed territory. In cooperation with the local government or\ngovernments in which such territory was situated prior to such\nannexation, it shall also cause a partial map to be made of such local\ngovernment or governments, which map shall be sufficient to show the\nexclusion of such territory from such local government or governments.\nCopies of such maps shall be filed in the office of the clerk of the\nlocal government, in the office of the clerk of each county in which the\naffected local governments are situated and in the office of the\nsecretary of state.\n