The Assignor wishes to assign the Lease to the Assignee and the Assignee desires to assume the Lease from the Assignor. WHEREAS, Assignor wishes to assign all its rights under that certain Rental Car Concession.Once you go into a purchase and sale agreement with your seller you need an assignment agreement to assign that to your end buyer. Use this sample agreement to draft an assignment and assumption agreement for use as an ancillary document in the context of an asset purchase transaction.