Mortgages. Complete legal descriptions — Must include municipality, ward if in the City of Pittsburgh, county and state, and one of the following:. An original deed form must be completed, signed and notarized.We suggest that you consult an attorney for assistance. All Allegheny County specific forms and documents listed below are included in your immediate download package: Assignment of Mortgage Form. All Allegheny County specific forms and documents listed below are included in your immediate download package: Mortgage Form. Allegheny County Mortgage Form. Please follow this checklist to ensure you have ALL documents required for filing NEW real estate.