That's the most interesting of the lot. It's a fairly famous building locally, at least among architecture types. It's the Kennedy-Warren apartment building, at 3133 Connecticut Avenue. What makes it interesting is that unlike all the other buildings from that post (which are new designs), the Kennedy-Warren is a bona fide 1920s art deco design that just happens to have been constructed in 2002. It's actually an addition to an existing 1929 building, built exactly according to the original plans.
It has a
wiki page.
Edit: I forgot that I mentioned this building way back on the first page of this thread, where I included a couple of additional pictures. I've republished them below:
Original detailing from 1930:
source
Detailing on the 2002 addition - the only difference is the weathering:
source