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CAMBRIDGE, MASS. — Bulfinch Cos. has negotiated three medical office leases totaling 134,816 square feet in Building 400-500 at the Cambridge Discovery Park (CDP) life sciences development in Cambridge. Arbor Biotechnologies, a genetic research firm, leased 36,171 square feet on the fifth floor. Kintai Therapeutics signed a deal for 72,296 square feet on the third and fourth floors. Simcere Innovation Inc., a medical research and development firm, has inked a lease for 26,349 square feet on the second floor. The three leases bring the building’s occupancy to 88 percent. The full CDP center offers 400,000 square feet of office and lab space across three buildings, which are still under development.