N.Y. Tax Law § 259
In the case of mortgages made by corporations in trust to secure payment of bonds or obligations issued or to be issued thereafter, if the total amount of principal indebtedness which under any contingency may be advanced or accrued or which may become secured by any such mortgage which is subject to this article has not been advanced or accrue thereon or become secured thereby before such mortgage is recorded, it may contain at the end thereof a statement of the amount which at the time of the execution and delivery thereof has been advanced or accrued thereon, or which is then secured by such mortgage; thereupon the tax payable on the recording of the mortgage shall be computed on the basis of the amount so stated to have been so advanced or accrued thereon or which is stated to be secured thereby. Such statement shall thereafter at all times be binding upon and conclusive against the mortgagee, the holders of any bonds or obligations secured by such mortgage and all persons claiming through the mortgagee any interest in the mortgage or in the mortgaged premises. Whenever a further amount is to be advanced under the original mortgage, or shall accrue thereon or become secured thereby, the corporation making such mortgage shall pay the tax on such amount at or before the time when such amount is to be advanced, accrues or becomes secured and shall, at the time of paying such tax, file in the office of the recording officer where such mortgage has been or is first recorded and with the tax commission a statement, verified by the secretary, treasurer or other proper officer, of said corporation of the amount of principal indebtedness to be so advanced, accruing or becoming secured, and the certification of any bond or bonds by the trust mortgagee shall be deemed an advance under this article. Such additional tax shall be paid to the recording officer where such mortgage has been or is first recorded and a receipt therefor shall be endorsed upon the mortgage and payment therefor shall be noted in the margin of the record of such mortgage and if requested a duplicate receipt for such payment shall also be given to the party paying such tax and the note of such payment or additional payment or such receipt shall have the same force and effect as the record of receipt of the tax which under this article is payable at or before the recording of the mortgage. If such additional tax is not paid as required by this section, the trust mortgagee shall not certify any bond or other obligation issued on account thereof. The corporation making such mortgage or the owner of the property which secures the mortgage debt shall annually within thirty days after July first, and until it shall appear by such statement that the maximum amount of principal indebtedness secured by such mortgage has been advanced, has accrued or become secured and the tax thereon paid, file in the office of the tax commission and the recording officer where such mortgage has been or is first recorded a statement, verified by the secretary, treasurer or other proper officer of said corporation, showing:
A failure to file any statement required by this section within the specified time shall subject the corporation or other person required to file such statement to a penalty of not less than one dollar nor more than one hundred dollars for each one thousand dollars of the maximum amount of principal indebtedness which is or under any contingency may become secured by the mortgage, which penalty in the aggregate shall not exceed the sum of five thousand dollars, recoverable by the attorney-general in an action brought in the name of the people of the state of New York.
N.Y. Tax Law § 259