The antique dealer that used to be at 9th and F must have some sort of deal with Douglas Development.
After a final sale because they "lost their lease," another antique dealer has opened on E street where the National Journal headquarters were during election season. Also a Douglas Development property.
We are not certain this is the same antique dealer--this one does have printed signs instead of handwritten ones on cardboard. But it certainly looks a lot like it.
Hopefully it's worth browsing through!