One Mortgage for multiple properties and one has a lien sale

[Agatha Oliveira]

Hello,

I was looking over data for a tax lien sale for Phiadelphia, PA. I noticed one property where it seems that someone got a single mortgage with a legal description containing several properties. One of those properties is being sold by the city due to missed real estate taxes. 

I am curious to know what happens in this case when the new owner receives the deed. Would the bank go after them? Are they responsible for any or part of the mortgage (as it doesn't seem to be paid off)?