I've been keeping an eye on this the past few days and it looks like they refinished the top deck. This image taken from EarthTV.com's live feed about 5 minutes ago.

but if anybody knows anything about what it is, please let me know

Not sure but in another post, it was said this one is being built, and actually in its final stages, there was one used at the oval office they built for Inauguration, but this one i believe Trump has been working on since 2018...and its in front of the White House....People arent sure what its going to be used for, some say gallows..lol..some say a stage for them to parade they got indicted.... idk....i kind of think that when its time for everything to come out in the open and we get the emergency broadcasting, that this might be there stage to tell the world the truth... ...idk just my opin

Crazy mess