Legal Question in Constitutional Law in Pennsylvania

The constitution limits the power of the government but generally not of individuals or private entities. The government can't violate your rights whether you are on public or private property. But the owner of private property may set limits on what you can do on the property which would be unconstitutional if imposed by the government.

This is a general answer and may not apply to your specific situation. Before I could offer any concrete guidance I would need to know more about the property you have in mind and what you want to do there.