often used in real estate transactions and mortgage lending, the assignment and assumption of lease agreement requires the landlord to consent to move forward. assignee hereby assumes and agrees to perform all of the terms, covenants, conditions and obligations required to be performed on the part of the landlord or lessor accruing under the lease on and after the effective date hereof in accordance with the terms thereof. this assignment shall be binding upon and inure to the benefit of the parties hereto and their respective transferees, successors and assigns. lawyers with backgrounds working on assignment and assumption of leases work with clients to help.