N.Y.C. Admin. Code § 24-115: § 24-115 Service of papers.

(a) Service of any written notice, order or decision related to equipment as required by this code shall be made as follows:

(1) Either by mailing the notice, order or decision directed to the owner of the equipment at the address listed in his or her application, work permit or certificate of operation or at the address where the equipment is located; or

(2) By leaving the notice, order or decision with the owner of the equipment, or if the owner is not an individual, with a member of the partnership or group concerned or with an officer or managing agent of the corporation.

(b) Service of any written notice, order or decision not related to equipment as required by this code shall be made on a person:

(1) By mailing the notice, order or decision directed to the person at his or her principal place of business; or

(2) By leaving the notice, order or decision with the person, or if the person is not an individual, with a member of the partnership or group concerned, or with an officer or managing agent of the corporation.

(c) Service of any written notice required by this code shall be made on the department or the commissioner by mailing the notice to the commissioner.