Technically, no. You can certainly market it yourself via things like Craigslist or the Washington Post classifieds. On the pro side, DIY will save you some money, because real estate brokerages will charge a service fee, often equivalent to one month of rent. What you will gain by using the services of a broker, however, is the confidence of having someone else screen prospective applicants, ensuring that they are properly qualified (credit checked, employment income verified, previous rental history checked, etc.) . . . plus the convenience factor of leaving it to someone else to show the condo to prospective tenants, which can become time-consuming. In addition, using a broker will expand your marketing, allowing you to reach and advertise the unit to a larger audience. A broker will also be able to advise you in setting the right price, in order to get the condo rented quickly.
I live in that area, so please feel free to reach out to me if I can be of any help.