D503 is not an agreement but is a guide that discusses the roles and responsibilities faced by Owners, Architects and Contractors on sustainable design and construction projects. D503 also contains model provisions for modifying or supplementing the following AIA Contract Documents: A201, General Conditions of the Contract for Construction; A101, Standard Form of Agreement Between Owner and Contractor where the basis of payment is a Stipulated Sum; and B101, Standard Form of Agreement Between Owner and Architect. D503 provides model language with explanatory notes to assist users in adapting those documents for use on a sustainable project. A201, A101 and B101, as standard form documents, cannot address all of the unique requirements and risks of sustainable design and construction. D503 is provided to assist users either in modifying those documents, or in developing separate supplementary conditions documents to attach to them.
To download this free document, go to http://info.aia.org/aia/sustainabilityguide.cfm.