This excerpt taken from the API 8-K filed Jan 13, 2010.
ARTICLE XXIX ENTIRE AGREEMENT
This Lease and the Exhibits, Riders and/or Addenda, if any, attached and signed by the parties, set forth the entire agreement between the parties. Any prior conversations or writings are merged herein and extinguished. No subsequent amendment to this Lease shall be binding upon Landlord or Tenant unless reduced to writing and signed. If any provisions contained in a Rider or addenda is inconsistent with a provision of this Lease, the provisions contained in said rider or addenda shall supersede the Lease provision.