N.Y.C. Admin. Code § 20-245: § 20-245 License fee; display.

a. The annual fee for such license shall be twenty-five dollars.

b. Each such license shall be displayed in a conspicuous place in the office or place of business of the licensee, or if a vehicle is used, in such vehicle, or if a guide has no office or uses no vehicle, he or she shall carry such license on his or her person at all times.