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DALLAS — Presidium Group LLC plans to expand and relocate its Uptown Dallas headquarters to Citymark on the Katy Trail. Bradford Commercial Real Estate Services arranged the lease. Presidium is moving Aug. 1 into a 7,912-square-foot space at 3100 McKinnon St., nearly doubling its size. The office tower’s second floor has been reconfigured into a multi-tenant space to accommodate the move. The transaction required subleasing Presidium’s existing headquarters at 2525 McKinnon St., which is being backfilled by telecommunications firm Zinwave Ltd. Ryan Hoopes of Colliers International was Zinwave’s broker for its sublease. Citymark spans 218,926 square feet and is 93 percent occupied.