N.Y. Real Prop. Tax Law § 1114

§ 1114. Redemption of a partial interest. 1. A person having an\ninterest in a specific or an undivided part of any parcel subject to a\ndelinquent tax lien, or in an undivided share in any parcel out of which\nan undivided part is subject to such lien, may redeem such part or share\nby paying the portion of the total amount required for redemption as is\nin proportion to the portion of the taxable assessed value of such\nproperty attributable to such interest.\n 2. Such payment shall be accompanied by an apportionment of such\ntaxable assessed value prepared by the assessor of the assessing unit in\nwhich such property is located in the manner prescribed by section nine\nhundred thirty-two of this chapter, or such other law as may be\napplicable, and the rules of the commissioner relating thereto.\n 3. When a partial interest is redeemed in a parcel which has been\nincluded on a list of delinquent taxes that has been filed pursuant to\nsection eleven hundred twenty-two of this article, but some or all of\nthe remainder of the parcel remains unredeemed, the enforcing officer\nshall, upon request, issue a certificate of redemption, describing the\npart or share of the parcel so redeemed as it was described on the\napportionment provided by the assessor pursuant to the applicable law\nand rules. Upon the filing of such certificate with the county clerk,\nthe county clerk shall enter on such list the notation "partially\nredeemed" and the date of the filing, opposite the description of such\nparcel. The notation "partially redeemed" shall have no effect upon the\nnotice of pendency relating to the portion of the parcel on which taxes\nremain unpaid.\n