("Assignment and Assumption") is made and entered into as of this ___ day of ______,. WHEREAS, Assignor wishes to assign all its rights under that certain Rental Car Concession.An assignment and assumption of lease is a legal real estate document that allows one party to transfer rights and obligations of a lease to another party. General Assignment and Assumption Agreement - Sara Lee Corp. Once you go into a purchase and sale agreement with your seller you need an assignment agreement to assign that to your end buyer.