Whenever in this code a license or permit is required for the maintenance, operation or conduct of any business or establishment, or for doing business or engaging in any activity or occupation, any person or corporation shall be subject to the requirement if by himself, or through an agent, employee or partner, he holds himself forth as being engaged in the business or occupation or solicits patronage therefor, actively or passively; or performs or attempts to perform any part of the business or occupation in the city. (2000 Code § 9-102)