Central City Hospital (loading dock)
Julian stumbles out of the hospital where Savitar is waiting in episode 3x07 "Killer Frost".
A.R.G.U.S. Facility (exterior)
Raya Van Zandt has Joss Mardon use her staff to overload the secure storage facility's power grid in episode 5x10 "The Flash & The Furious".
Earth-203 New Gotham
The Huntress races across a rooftop talking to Oracle as the antimatter wave races across the planet in episode 6x09 "Crisis on Infinite Earths: Part Three".