Commercial Brokerage with offices in Milwaukee and Sheboygan, WI. CSA Commercial was founded in 2001 as a real estate investment, development, and brokerage firm with offices in Milwaukee and Sheboygan. The firm is acutely focused on projects with civic dividends. Whether bringing jobs to a neighborhood, putting a building back into productive use, or employing sustainable design strategies, CSA Commercial creates value and a competitive advantage for the owners, tenants, and communities with which we do business.