As noted elsewhere Rosslyn is a wasteland for dining. Along with another thread about a hidden better higher value lunch alternative there is Ahra Cafe located at 1100 Wilson Boulevard in the Twin Towers Building with Channel 8 on the ground level off the lobby.
Ahra is only open for breakfast and lunch on weekdays and has no outdoor signage. Their breakfasts and lunches are hearty and offer good value for the price. Ahra's specialties are slow roasted turkey, ham, roast beef and brisket sandwiches. They are hearty, large, and accompanied by a wide variety of extras. They offer great value for the price and a cut above the world of chains that proliferate in that wasteland.