The MSBIZI is a non profit organization operating on behalf of commercial property owners who agree to tax themselves in order to provide high quality public space improvements that complement, not replace, City of Ann Arbor services, to make the neighborhood on South Main Street from William to Huron cleaner, safer and more vibrant.

The group's activities led to the formation of the Main Street BIZ, a taxing authority for improvements on Ann Arbor's Main Street.