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PHILADELPHIA — A joint venture between Ensemble Real Estate Investments, Mosaic Development Partners and Oxford Properties Group has broken ground on a 137,000-square-foot life sciences project at the Philadelphia Navy Yard. The project is being developed on a speculative basis for cell and gene therapy users and will be able to support tenants with space requirements ranging in size from 5,000 to 35,000 square feet. CRB is designing the project. A completion date was not disclosed.