Colliers| Wisconsin offers clients in the Wisconsin market, expertise in every property type. Wisconsin’s Colliers office offers a comprehensive portfolio of real estate services to occupiers, owners and investors on a local, regional, national and international basis, including: Brokerage Services, Corporate Solutions, Property Management and Valuation & Advisory Services. Colliers is the third-largest commercial real estate services company in the world, with over 12,300 professionals operating out of more than 522 offices in 62 countries.