Legal Question in Civil Litigation in Pennsylvania

What does the lease or any reasonable rules/regulations say about guests on the premises? Is the person spending the night? Staying for a long period of time?

You claim the landlord is trespassing, which is not possible as it is his property. The landlord does have a right to know who is on the property. However, the tenant and his guests have a right to quiet enjoyment of the premises.

So you will have to read the lease, read any rules/regulations about guests and it will depend on the circumstances. The landlord paying a social call at 2:00 am is probably not ok, but if the landlord comes during normal business hours, it probably is ok. And a landlord also has the right to reasobably inspect his property - again read your lease to see if it addresses this.