No amendment or waiver of any provision of this Agreement or consent to any departure by any Lessee therefrom shall in any event be effective unless the same shall be in writing and signed by the Buyer and the Lessee Representative and, if such amendment or waiver affects the obligations of Guarantor or any of its Affiliates (other than the Lessees), Guarantor consents in writing thereto, and then any such waiver or consent shall be effective only in the specific instance and for the specific purpose for which given.