The Contractor agrees to indemnify, protect, defend and hold harmless the. A Pennsylvania residential purchase agreement establishes a legal arrangement between a buyer and a seller in a real estate transaction.This is a Legally Binding Contract; If Not Understood, Seek Competent Legal Advice. This Contract Specifications Manual provides terms and conditions which are applicable to all AGREEMENTS entered into between ALLEGHENY COUNTY DEPARTMENT OF. I'm gonna break down all the terms and conditions so you can understand what it means and we're gonna fill that out so you can have a real-life example of it.