@Account Closed, this question has come up a few times lately here on BP. I think squatting is being a problem in the City. Recently (two weeks ago) I discovered a home I was scheduled to close on had a family living in the home. The bank still owns the property. They offered the squatter family $1000 in cash. The family agreed and two days later rescinded and said they were not leaving the house. The bank has now started ejectment proceedings.
I have learned a lot since then about the definitions of a squatter, trespasser, and tenant.
I understand you have spoken with your lawyer and received his advice. I have added the definitions below for others on the site who may find the information helpful.
Before, you can determine if an eviction or ejectment is the right course of action you must first have define what the person living in your home is.
A trespasser is a person who is occupying the home temporarily. They don't have any utilities or mail in their name. No furniture moved in. In this case you would file a police report for the trespassing and start the eviction proceedings.
A squatter is someone who has established a residence. They have been in the house a longer period of time, 3 weeks or so. They have taken steps to make the home theirs. An ejectment is needed in this case.
If the person is a holdover from an expired lease. Or like some here on BP did, you purchase the property knowing the squatters were there, you have a landlord tenant relationship. In the case eviction is the way to go. But you have already stated it is not a holdover tenant.
Both of these are long processes, so don't expect to get your property back for 2-3 months at a minimum.
Lastly, you can sue the squatters. However, where would you send the court documents? I don't think they will leave you with a forwarding address. Assuming this is not a scam and they truly have nowhere to live, they won't have the money to pay you. While this really sucks, I think this may be the new cost of business in Philadelphia.
Good Luck