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PHILADELPHIA — Ballard Spahr, a national law firm, has signed a 15-year lease renewal for 179,307 square feet at BNY Mellon Center in Philadelphia. Wayne Fisher and Craig Scheuerle of Newmark Grubb Knight Frank represented the landlord, CommonWealth REIT, in the transaction. CBRE represented the tenant. The property is managed by Reit Management & Research LLC, Real Estate Services. The BNY Mellon Center was built in 1990. Firms such as BNY Mellon, FMC Corp. and Sunoco are headquartered in the building, which has maintained occupancy rates above 90 percent since its construction.