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You have multiple classes of property in reality, in this case we will consider three: Private Property, Public Property, Commercial Property (Privately owned, publicly accessible). All property is subject to some regulation, zoning laws are one good example, while public property is perhaps the most regulated seeing as how it is government controlled. Private property is not subject to much regulation, and is often considered by the public to be unregulated. Finally the commercial property is a hybrid of private and public property and is subject to quite a bit of regulation. Commercial property owners can't bar customers based on race, they have to ensure that their buildings and parking lots have sufficient access for disabled customers, They can not force employees to vote for one candidate over another, and so on. The Parking lot legislation is actually a minor regulation that does not cost employers anything to implement and helps protect the rights of the employees. I'm afraid that this is the best explanation I can come up with at nearly 2am. maybe when I am more awake I can come up with something better.