OP - when your people look at Arlington, know that there is a difference between North Arlington and South Arlington. The two are divided by a road (Route 50). Both have metro access, although there seem to be more fun places to live along the metro in North Arlington (that’s where these communities we’ve been mentioning - Courthouse, Clarendon, Virginia Square, Ballston) are located, and that’s what is adjacent to City of Falls Church and the Falls Church metro stops (East Falls Church, West Falls Church, Dunn Loring).
South Arlington has the metro also - it runs through the Pentagon, Pentagon City, Crystal City, Reagan National Airport. And there are lots of apartments in those areas, not so much townhomes if that’s what your people are looking for. Also those neighborhoods don’t tend to be as “alive” in terms of people out and about enjoying the neighborhood. There’s a good amount of office space, indoor and outdoor malls, and a decent amount of restaurants, but it doesn’t feel as vibrant urban walking around corridor like. Housing costs tend to be higher in North Arlington (not always true, there are some very expensive areas of S. Arlington, and some less costly N. Arlington, but typically true). You will be able to tell if you are looking at properties on one side or the other because every street address will have a North or South descriptor.