New York Consolidated Laws, General City Law - GCT § 37. Extensions of time

(a) General.  The administrator may grant a reasonable extension of time for payment of tax or estimated tax (or any installment), or for filing any return, declaration, statement, or other document required pursuant to this local law, on such terms and conditions as he may require.  Except for a taxpayer who is outside the United States, no such extension for filing any return, declaration, statement or other document, shall exceed six months.

(b) Furnishing of security.  If any extension of time is granted for payment of any amount of tax, the administrator may require the taxpayer to furnish a bond or other security in an amount not exceeding twice the amount for which the extension of time for payment is granted, on such terms and conditions as the administrator may require.