Based in Mankato, Brennan Construction constructs and remodels buildings on time and budget throughout So. Minnesota. Woman-owned, we offer design/build, general contracting, construction and project management services for multi-housing, commercial, retail, institutional and industrial properties. Through relationships and strategic, solution-oriented unions with key professionals and tradesmen, our commitment, strength of great alliances and our philosophy of building structures for success, prosperity and preservation ensure client satisfaction. Brennan Companies.