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WALTHAM, MASS. — Dassault Systèmes has signed a lease for 320,000 square feet of office space in Waltham for its new American corporate headquarters. The company will initially move into the 211,741-square-foot building at 175 Wyman St. and will later expand into its remaining leased space at 185 Wyman St. The move-in will occur in mid-2011. The company currently leases facilities in Concord and Lowell, Mass., which will be consolidated. Brendan Callahan and Alex Dauria of Jones Lang LaSalle represented Dassault in lease negotiations. The firm will also serve as project manager for the tenant build-out. Charles Batchelder of Wyman Street Advisors represented the landlord, Hobbs Brook Management.