N.Y. Lien Law § 16: Assignment of contracts and orders for public improvement to be filed

§ 16. Assignment of contracts and orders for public improvement to be

filed. No assignment of a contract for the performance of labor or the

furnishing of materials for a public improvement, or of the money, or

any part thereof, due, or to become due, therefor, nor an order drawn by

the contractor or sub-contractor upon the public corporation, or the

head of the department or bureau having charge of the construction or

demolition of such public improvement, or the financial officer of the

public corporation, or other officer or person charged with the custody

and disbursement of the corporate funds applicable to the contract for

such public improvement, shall be valid unless such assignment or order,

or a copy thereof, be filed within twenty days after the date of such

assignment of contract, or such assignment of money, or such order, with

the head of the department or bureau having charge of such construction

or demolition, and with the financial officer of the public corporation

or other officer or person charged with the custody and disbursement of

the corporate funds applicable to the contract for such public

improvement, and such assignment or order shall have effect and be

enforceable from the time of such filing, and no such assignment or

order shall have any validity until the same shall have been so filed,

and every such assignment or order, not filed, shall be absolutely void

as against a subsequent assignee in good faith and for valuable

consideration, whose assignment or order is first duly filed. The

financial officer of the public corporation, or other officer or person

with whom the assignment order, or copy thereof, is filed, shall enter

the facts relating to the same in the lien book or other book provided

for such purpose.