The 1155 F Street (F and 11th Sts NW) building has been under re/construction for a couple of years. The entire property is gorgeous. The first tenant, Guess, has opened it's only store within in the District of Columbia on the first floor of the office building. Law firms with other minor tenants will fill the top floors. There is another empty retail space on the first floor facing F Street, although I don't know the plans for that space.
Guess is within two blocks of several other clothing stores including H&M, Zara, JoS. A. Bank, Banana Republic and American Apparel. Just as 14th Street NW (b/t P and U Streets) has become a mini furniture district, Metro Center could become an area known for a concentration of clothing stores. Forever 21 is slated to open by the end of the year in the Woodward & Lothrop building; the same building which houses H&M and Zara. Forever 21 and Guess also have stores in the Fashion Center at Pentagon City mall.