This excerpt taken from the SLG 10-K filed Mar 15, 2005.
Entire Agreement; Amendments. This Agreement contains the entire agreement and understanding among the parties hereto with respect to the subject matter hereof and supersedes all prior and contemporaneous agreements, understandings, inducements and conditions, express or implied, oral or written, of any nature whatsoever with respect to the subject matter of this Agreement. The express terms of this Agreement control and supersede any course of performance and/or usage of the trade inconsistent with any of the terms of this Agreement. This Agreement may not be modified or amended other than by an agreement in writing signed by the parties hereto.