definitions

BASE BUILDING:
"...The base building normally includes the building's primary structure; the building envelope (roof and facade) in whole or part; public circulation and fire egress (lobbies, corridors, elevators and public stairs); and primary mechanical and supply systems (electricity, heating and air conditioning, telephone, water supply, drainage, gas, etc.) up to the point of contact with individual occupant spaces.
Base buildings provide serviced space for occupancy..."

WALL: separates inside from outside, part of the base building.
PARTITION: divides interior space into rooms, not structural. Part of the fit out.