N.Y. RPT Law § 418

§ 418. Foreign governments. 1. Real property of a foreign\ngovernment which is a member of the United Nations or any world-wide\ninternational organization as defined in section four hundred sixteen of\nthis chapter, the legal title to which stands in the name of such\nforeign government or the principal resident representative or resident\nrepresentative with the rank of ambassador or minister plenipotentiary\nof such foreign government to the United Nations or other such\nworld-wide international organization, used exclusively for the purposes\nof maintaining offices or quarters, for such representatives, or offices\nfor the staff of such representatives, shall be exempt from taxation,\nexcept levies made on a city-wide or borough-wide basis which are\ncollectible with the real property tax, and special ad valorem levies to\nthe extent provided in section four hundred ninety of this chapter. If\na portion only of any lot or building of any such government or\nrepresentative is used exclusively for the purposes herein described,\nthen such portion only shall be exempt and the remainder shall be\nsubject to taxation unless otherwise exempt from taxation by law. The\nexemption granted by this section shall apply to taxes which become due\nand payable after the date such property is used for the purposes herein\nstated, and shall continue with respect to such property as long as it\nremains the property of such government and is used for the purposes\nherein stated and no longer.\n 2. If at any time (a) special ad valorem levies or special\nassessments levied against the property or (b) taxes with respect to the\ntaxable portion of the property, if any, are in arrears, the exemption\ngranted herein shall not apply until the arrears are fully paid.\n