KALAMAZOOO, MICH. — NAI Wisinski of West Michigan has brokered the sale of an 18,600-square-foot office building in Kalamazoo for an undisclosed price. ABTZ Properties purchased the property and Braintrust Behavioral Health LLC will occupy the majority of the space. The building, located at 5942 Stadium Drive, will house Braintrust’s administrative and clinical staff offices as well as an autism center. The company is an independent healthcare provider focused on supporting children, families and adults with behavioral change.Kara Schroer of NAI Wisinski represented ABTZ Properties in the sale. Chip Hurley of Signature Associates and Noah Davey of NAI Cressy represented the undisclosed seller. NAI Wisinski has been retained as leasing agent for the approximately 3,000 square feet of remaining space.