Assumption Agreement – Evidences the transfer of an obligation on a Deed of Trust from one owner to another owner. The cost to County of completing Contractor's performance shall be deducted from any sum due Contractor under this Contract, without prejudice to County's.Official Forms for Viewing and Downloading. Ensure all necessary financial information is accurately provided. Purchase price is not a simple calculation based upon square footage but an agreement as to what Buyers will pay and what Sellers will accept. Additional details can be found in the Healthcare Assumptions and Methods section.