Cornerstone Investors is a Twin Cities based, commercial real estate firm specializing in the strategic acquisition and renovation of underutilized properties throughout the Twin Cities metropolitan area. With 20 commercial buildings covering over 1.2 million square feet, we offer professional, in-house property management to give our tenants the best care and attention needed to allow their business to thrive. Cornerstone Investors was established in 1990 by its President and CEO, Joel Buttenhoff. More than 150 tenants have chosen to locate in within the portfolio.