South Bay Mental Health Center Inc. acquired 1115 W. Chestnut St. within Brockton Executive Park in Brockton, MA, from The New England Realty Group for $3.65 million, or about $90 per square foot. The two-story, 40,500-square-foot, Class B office building was built in 1986 and is in the Boston - Route 24 submarket. There were no brokers involved.