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PHILADELPHIA — Zahav Biosciences, a developer of cancer treatments and therapies, has signed an 8,200-square-foot lease for its new headquarters at Race Street Labs, a 180,000-square-foot life sciences facility in Philadelphia. Patrick Kelley of Avison Young represented Zahav Biosciences in the lease negotiations. Brian Young and Paul Garvey of Cushman & Wakefield represented the landlord, Iron Stone Real Estate Partners.