Hi podge,
If you’re projects focus ( and marking ) is relating to the 3D modelling / texturing of your work, then you can do a "drive through" of the building using this ( export as Shockwave 3D using Cinema4D )
http://www.candointeractive.com/gamedesign/car
Just drop a box where you want the player to start ( and sized / scaled accordingly ), call it carStart, and export.
If you need to program your walkthrough as well, then this won’t help unless you know how to program in Director, and use this tool to see if Shockwave 3D can handle your scene.
Mal