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HOUSTON — CBRE has negotiated a 126,000-square-foot office lease renewal at 717 Texas, a 697,195-square-foot property in downtown Houston, on behalf of Calpine, a provider of natural gas and geothermal resources. Calpine has been an anchor tenant at the 33-story building, which is owned and developed by Hines, since 2003. Lucian Bukowski of CBRE represented Calpine in the lease negotiations. Win Haggard of Colvill Office Properties represented Hines.