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HOUSTON — Tier One Warranty has leased 11,190 square feet of office space at Cornerstone Tower in Houston for its new headquarters. Jay Kyle of Colliers International represented Tier One in lease negotiations. Marci Phillips and Livy Romo of PM Realty Group represented the landlord, KBS Realty Advisors Houston Portfolio. Cornerstone Tower is a five-story, 71,008-square-foot office property located at 3707 FM 1960 West.