TID No. 4 was created in 2009 as a mixed-use district. It is located in the northwest quadrant of US Highway 51 and Wisconsin Highway 19. The intention of this district is to induce economic development by providing improvements such as public infrastructure and business development incentives within the northern portions of the Northtown Corporate Park.

The district’s specific objectives are to:

• Help finance the infrastructure needed to serve anticipated industrial and supporting commercial development, in a location where purely private financing of infrastructure may not be feasible.
• Address regional transportation and utility needs and while increasing traffic safety, accessibility, and utility services to the TID area.
• Compensate for current infrastructure deficiencies resulting from the distance of this TID area from the historic center of the Village, such as through collector road extensions and water system enhancements.
• Encourage higher value industrial and supporting commercial uses than the Village would otherwise be able to attract to this area.
• Enhance economic activity along the Highway 51/19 corridors, building on current and planned economic development activities outside of the TID.

• Major improvements in TID No. 4 include Bell Labs, Penske Truck Rental, and Fifty One Self Storage.
• TID No. 4 started with a base value of $345,700 and currently has an increment value of $62,000,600.
• The expenditure deadline for this district expired in 2024 and the statutory closing date of this district is in 2035. Currently, TID No. 4 is projected to pay its obligations early and close in 2031, subject to changes in the tax revenue or an extension.