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IRVING, TEXAS — Connecticut-based IT consulting firm Gartner Inc. has signed a 54,920-square-foot office lease expansion at Las Colinas Connection 1 in Irving. According to LoopNet Inc., the property was built in 1999 and spans 231,681 square feet. Randy Cooper, Matt Heidelbaugh, Amber Roberts, Lou D’Avanzo and Andy May of Cushman & Wakefield represented the tenant in the lease negotiations. Sarah Hinkley of Thirty-Four Commercial and Joel Pustmueller of JLL represented the landlord, Piedmont Office Realty Trust.