Â§47-2853.171. SCOPE OF PRACTICE FOR REAL ESTATE SALESPERSONS.
For the purposes of this subpart, the term â€œreal estate salespersonâ€ means any person employed by a licensed real estate broker to manage or lease; rent or offer to lease or rent; list for sale, sell, or offer for sale; buy or offer to buy; negotiate the purchase or sale, or exchange of real estate; or to negotiate a loan on real estate.
So, since an ad would fall under one of these terms... I would say, you would have to be licensed --- unless you meant the question as a private person and not a real estate salesperson.
2615.1 Advertising real property in any communications medium, by persons licensed under this chapter, is subject to the disclosure, agency, and duty requirements of this chapter, the Act, the District of Columbia Real Estate Licensure Act of 1982, effective March 10, 1983 (D.C. Law 4-209; D.C. Official Code Â§ 42-1701 et seq.), as amended, and any other applicable District or federal law, rule, or regulation.
2615.2 Institutional advertising may not contain false or misleading information.
2615.3 All advertising shall be under the direct supervision of the principal broker or supervising broker and shall be in the name of the firm. The firmâ€™s licensed name shall be displayed clearly and legibly on all advertising.
2615.4 Individual licensees shall not use a nickname in any advertising medium.
2615.5 Online advertising, including e-mail, web pages, message board postings, instant messages, chat, or any other method of communication that may be transmitted over any computer network, is subject to the requirements of this chapter, 17 DCMR Chapter 27, the Act and the District of Columbia Real Estate Licensure Act of 1982, effective March 10, 1983 (D.C. Law 4-209; D.C. Official Code Â§ 42-1701 et seq.), as amended.
2609.6 A real estate salesperson shall not knowingly permit the use of the salesperson's name in any advertisement without the name and telephone number of the brokerage company with whom the salesperson is affiliated.
more info Nick --