I find interesting the impact on productivity that the current policy is having. All employees in the building are notified that there is a vehicle under observation, and a deadline for towing. Apparently the towing policy has been selectively enforced, because people gather to see "will they or won't they this time". And depending on the building management's response, it can impact how the employees will view / treat this policy in the future.

And this has happened "several times over the past few months".

This would seem to warrant a policy change to something less intrusive and more consistent.