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HOUSTON — Shell has renewed a 15-year lease for 804,491 square feet in One Shell Plaza and 471,934 square feet in Two Shell Plaza in Houston, a combined 1.22 million square feet of office space, the largest office lease transaction in the world in 2011. Tim Relyea and Joe Peddie of Cushman & Wakefield's Houston office represented Shell in the lease transaction. Hines, the buildings' owner, was self-represented by Charles Elder and Chrissy Wilson. As part of the lease agreement, Hines will make capital improvements to the property, including mechanical and electrical upgrades and redesigned outdoor plaza areas.