N.Y.C. Admin. Code § 28-429.7.3: § 28-429.7.3 Place of business.

At such place of business, there shall at all times be prominently displayed a permanent sign stating the name of such license holder, the license number of such licensee, and the words “licensed electrician” or “licensed electrical contractor” on a plate glass window and the name of the master electrician business if different than the name of the license holder; or an outside sign of permanent construction fastened and readily visible to pedestrians; or if such place of business be an office, commercial, or industrial building, the names shall be indicated on the entrance door of the particular portion of the premises or on a bulletin board on the main floor. The office or other place where the master electrician business is to be conducted may be shared by 1 or more master electrician businesses. However, each business whether in the form of a sole proprietorship, partnership, or corporation, shall distinguish its identity from any other business sharing the same office space. Such distinctions shall be maintained in a manner satisfactory to the department.

(L.L. 2024/128, 12/21/2024, eff. 12/21/2025)