Irving-based Flowserve Corp., one of the world’s largest manufacturers of pumps, valves, seals and components, has extended its long-term lease for 125,106 square feet at The Towers of Williams Square at 5215 N. O’Conner Blvd. in Las Colinas. The company will keep its headquarters in Las Colinas where it occupies four floors in the tower. It has more than 320 corporate employees.

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