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HOUSTON — EnerVest, a Houston-based oil and gas company, has expanded by 36,721 square feet and renewed its headquarters lease for a total of 117,316 square feet in First City Tower, located at 1001 Fannin in downtown Houston. Chip Colvill and Michael Anderson of Colvill Office Properties represented the landlord, FC Tower Property Partners, an affiliate of JMB Realty of Chicago. Meanwhile, Tim Relyea of Cushman & Wakefield of Houston represented EnerVest. First City Tower is a 1.3 million-square-foot, 49-story office building bounded by Fannin, McKinney, San Jacinto and Lamar streets in Houston's central business district.