Difference Tax Auction/ Foreclosure Auction

[Michael P.]

In PA, when going to a Tax auction all leans are free and clear, is it the same for a foreclosure?  I am targeting a specific area that has great rental potential, an area I know family has over 40 units.  In the tax auction not many properties are coming up, but for foreclosures, tons.  So what should I keep a close eye on, or investigate deeply when trying to acquire a foreclosure auction property.