We have a few workers in my building who either park in their cubes/offices, or a few staffers on the 4th floor park their bikes together next to all of the lateral files near the back stairs (but not in the way of emergency egress, even with 2-3 bikes back there). I am one of the former. Most do use the bike racks out in front and alongside the building. I even have an old carpet protector on the floor in my cube so the bike doesn't ruin the carpet tiles in the winter.

I think on our campus the policy is set by the building managers... and I have now outlived three of them, possibly four depending on how one reads the org charts, and none of them have said anything to any of us who park inside. Actually, building manager #4 parked her bike in her cube.