This Standard Document contains provisions to incorporate an assumption of the delegated obligations and an optional novation into the assignment agreement. Unlike notation, assignment contracts do not annul the initial agreement and do not establish a new agreement., a Texas corporation. A Novation Assignment Agreement is a legal contract that transfers the contractual obligations of one party (assignor) to a third party (assignee). AGREEMENT. 1. Assignment, Assumption, and Novation. What is an Assignment And Assumption Agreement? An assignment and assumption agreement transfers one party's rights and obligations to a third party. GSA requires that its landlords enter into a novation agreement with GSA and the purchaser, as the new landlord, in order to transfer a lease.