N.Y. Lien Law § 11: Service of copy of notice of lien

§ 11. Service of copy of notice of lien. Within five days before or

thirty days after filing the notice of lien, the lienor shall serve a

copy of such notice upon the owner, if a natural person, (a) by

delivering the same to him personally, or if the owner cannot be found,

to his agent or attorney, or (b) by leaving it at his last known place

of residence in the city or town in which the real property or some part

thereof is situated, with a person of suitable age and discretion, or

(c) by registered or certified mail addressed to his last known place of

residence, or (d) if such owner has no such residence in such city or

town, or cannot be found, and he has no agent or attorney, by affixing a

copy thereof conspicuously on such property, between the hours of nine

o'clock in the forenoon and four o'clock in the afternoon; if the owner

be a corporation, said service shall be made (i) by delivering such copy

to and leaving the same with the president, vice-president, secretary or

clerk to the corporation, the cashier, treasurer or a director or

managing agent thereof, personally, within the state, or (ii) if such

officer cannot be found within the state by affixing a copy thereof

conspicuously on such property between the hours of nine o'clock in the

forenoon and four o'clock in the afternoon, or (iii) by registered or

certified mail addressed to its last known place of business. Failure to

file proof of such a service with the county clerk within thirty-five

days after the notice of lien is filed shall terminate the notice as a

lien. Until service of the notice has been made, as above provided, an

owner, without knowledge of the lien, shall be protected in any payment

made in good faith to any contractor or other person claiming a lien.