From episode 7x04 "Can't Fight Biology".
The team investigates the strange occurrences around the city.
Stantz and Zeddemore act as entertainment at a child's birthday party. Filmed in the third floor captain's quarters.
Source: Spook Central
From episode 4x05 "The Road to Hope".
The team sets up their offices inside an old fire station.
Source: The Worldwide Guide to Movie Locations
From episode 3x03 "Faith, Hope & Trick".