Hi Kyle there are a host of other potential expenses once you buy, a key one being the ejectment of the former owner or tenant of the property your purchase. 

Assuming you have pissedsionrights....you legally either need to evict or get an ejectment order, depending on your state/local procedures. 

Eject, eject!

It is not an eviction process in PA, it is a process called ejectment that is handled at a different level in the court system and costs quite a bit more.And you used the word "immediately" - when you hire your attorney to pursue the legal action, you will find out that immediately is not how it works.And you used the term "tax lien" - PA is a tax deed state (except the City of Philadelphia has some special rules that allow for tax liens).Maybe @David Krulac or @Chris K. might have something to add ...

I also explained to her the situation, told her I do not want the house, I can deed it over to her since she is his attorney, and if they don't make a move come Monday I'm selling it to someone who DOES want the property and who most likely will be filing an ejectment that day.   

Ok, a squatter who occupies a property for which you have a superior claim of right or interest is removed by a "force able ejectment" in many juristctions. 

The RE agent told me straight out to seek advice from a lawyer for the "ejection" that will take place in court.

Your buyer’s agent seems like they’ve done all the right steps, so it’s now time for the buyer’s agent’s broker to help you eject from this deal.  

Question: can you self-eject for $525k + closing/holding costs if your projections are wrong? 

If they do not make the payment within given 10 day period you can file for action in ejectment with the court.