BRUNSWICK AND TOPSHAM, MAINE — A joint venture between Presidium Group and Portland, Maine-based Helios has acquired a 407-unit multifamily portfolio in the Mid-Coast area of Maine for an undisclosed price. The portfolio includes five assets located adjacent to the former Brunswick Naval Air Base in Brunswick and a sixth property located in the neighboring town of Topsham. The portfolio consists of a combination of townhouses, garden-style apartments, single-family homes and land for future development. The Mid-Coast area consists of approximately 95,000 people within a 15-mile radius. The name of the seller was not released.