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DALLAS —Newmark Knight Frank (NKF) and E. Smith Advisors, a brokerage firm headed by former Cowboys running back Emmitt Smith, has secured a 50,000-square-foot office lease renewal at Campbell Centre in Dallas. John Wolf and Sara Fredericks of NKF represented the tenant, Istation, a provider of electronic education services, in the lease negotiations. The duo credited the Cowboys legend in facilitating their relationship with Istation, which is headquartered at the property. Haberman & Haberman owns Campbell Centre, a development that was built in 1978 and totals 322,382 square feet.