This program is a formal, temporary, written agreement with your mortgage lender designed to temporarily stop foreclosure proceedings. This agreement shall inure to the benefit of and be binding upon the heirs, devisees, successors and assigns of the parties hereto.The mortgage modification agreement is a legal document between a lender and borrower to change an existing loan's terms. The Modification Agreement defines the changes to the home loan. Send loan modification application form via email, link, or fax. You can also download it, export it or print it out. The mortgage modification agreement is a legal document between a lender and borrower to change an existing loan's terms. Step 2: Reach out to your lender.