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PHILADELPHIA — RSM US LLP has signed a 22,340-square-foot office lease in downtown Philadelphia. The provider of assurance, tax and consulting services is relocating from 30 South 17th Street to the entire 21st floor at 1735 Market Street, a 54-story, 1.3 million-square-foot tower. Newmark and Cushman & Wakefield co-represented the tenant in the lease negotiations. Keith Cody and Gordon Hough represented the landlord, Silverstein Properties, on an internal basis.