A new addition to the downtown nightlife scene, Club X (as in “Club 10”) Ultralounge exudes sexy style. The newly renovated, two-story space sports gorgeous hardwood and stone tile floors, lots of glowing neon and retro-mod touches. There are two bars, two dance floors and acres of plush leather sofa seating areas for the trendy bottle service drinks. Downstairs, a sushi and tapas bar turns out sophisticated, tempting plates (and it’s open for lunch). Upstairs, there’s a VIP area and a DJ booth spinning lounge, house, hip-hop and dance beats. Guest DJs change the flavor of the crowd from night to night, but everyone’s here to have a party. Valet parking available. (10 S. Calvert St., 410-727-1294)