Burning Building (exterior)
The fire department arrives at a burning building only to have the Flash arrive to put out the fire in episode 2x02 “Flash of Two Worlds”.
Barry and Oliver look back at the cathedral after it is blown up by Vandal Savage in episode 2x08 “Legends of Today”.
The Flash saves several people from a car that then explodes in episode 1x12 “Crazy for You”.
Square near Jitters
Barry gives Ralph a superheroing lesson when they are mugged after getting coffee in episode 4x06 “When Harry Met Harry…”.