C.R.S. § 44-20-134

A motor vehicle dealer or used motor vehicle dealer or any agent of the dealers shall not advertise any offer for the sale, lease, or purchase of a motor vehicle or a used motor vehicle that creates the false impression that the vehicle is being offered by a private party or by a buyer’s agent or that does not contain the name of the dealer or the word “dealer” or, if the name is contained in the offer and does not clearly reflect that the business is a dealer, both the name of the dealer and the word “dealer”.