Originally Posted by
sexualbanana
I would argue that you're not being forced to park in the lot either. When you enter, for example, an Impark parking lot you've implicitly consented to the terms of use of the lot. In this case it's: use the parking spot and pay for its use. Lots have like a million signs that remind you that a) you're entering a pay lot, b) you're on private property and c) you need to pay for your parking spot.
As for Cash Money's point: Just because Impark/Vinci and other companies don't own the land doesn't mean they can't administer and enforce the rules of the property, in fact that's what they're there for. If someone trespasses on a tenant's property, the tenant can still claim trespassing. It doesn't have to be the landlord/owner doing it.