A club operator once described as Washington, D.C.’s "King of Lounge" is preparing to land in East Liberty. Mauricio Fraga-Rosenfeld, principal of Washington, D.C.-based Latin Concepts, has finalized a deal with developer Nigel Parkinson to occupy the 39,000-square-foot former American Legion building on Highland Avenue. That's just across the street from where Parkinson’s group is building a new Hotel Indigo on Broad Street slated to open in the last quarter of this year. I had the unexpected…