As we noted, the four Invasion posters for Supergirl, The Flash, Arrow and Legends of Tomorrow feature the Hall of Justice in the background.
Tonight's episode of The Flash gave us a look at that Hall of Justice, which is actually the new version of STAR Labs.
As a result of Barry resetting the timeline, STAR Labs now looks like the Justice League Hall of Justice.
Executive producer Andrew Kreiseberg did previously note they based based their Tyler Hoechlin Superman in part on the Superfiends animated series, and the Legion of Doom is also coming to DC's Legends of Tomorrow.
Check out the STAR Labs before and after below.
Before The Flash Season 3:
The Flash Season 3:
Superfriends Hall of Justice: