New York Consolidated Laws, Real Property Law - RPP § 333-a. Same;  maps to be filed

No conveyance of real property or other document relating to real property, executed on or after July first, nineteen hundred thirty-one, which contains a recital of or a reference to a map made on or after that date or which has thereunto attached such a map, shall be received for record or recorded by such recording officer unless and until a duplicate of such map, prepared in the same manner as prescribed for the preparation of maps in section three hundred and thirty-four of this chapter, shall be filed in the office of such recording officer and no map, attached to any conveyance or other document relating to real property, shall exceed the standard legal cap size, except that in the county of Putnam the size shall be not less than twenty by twenty inches and not more than thirty-six by forty-eight inches in size and that in the counties of Westchester and Dutchess the size shall not be more than thirty-six by forty-eight inches.  This section shall not apply to the counties of New York, Kings, Queens, Nassau, Suffolk, Bronx, Onondaga, Erie, Monroe or Richmond.

Notwithstanding any of the provisions of this section a conveyance of real property or other document relating to real property shall not be invalid or void for failure to file therewith any map referred to in such conveyance or document.