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BILLERICA, MASS. — Calare Properties has completed the sale of a laboratory space located at 749 Middlesex Road in Billerica. An undisclosed buyer purchased the property for $6.2 million. Calare Properties originally acquired the vacant 40,000-square-foot lab facility in 2013 for $3.3 million while concurrently leasing the entire property to RainDance Technologies, a biotechnology company.