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PITTSBURGH — Law firm Steptoe & Johnson PLLC has signed an 6,572-square-foot office lease expansion in Pittsburgh. The tenant is expanding its footprint at One PPG Place, a six-building, 1.5 million-square-foot complex located in the downtown area, by about 40 percent for a new footprint of 23,000 square feet. Lesa Nickelson French of Savills and David Koch of Newmark represented the tenant in the lease negotiations. Highwoods Properties owns One PPG Place.