Data centers are allowed in the I-1 Industrial District only as a special use, so they require approval of a special use permit rather than being permitted as of right. Data Centers

An I-1 data-center site must contain at least 1 acre and have at least 100 feet of lot width measured at the building line. Every lot or tract of land

Buildings and structures in I-1 may occupy no more than 40 percent of the lot area, including accessory buildings. Not more than forty percent

I-1 structures are generally limited to two stories or 35 feet, whichever is less; a greater height requires a special-use authorization with the permitted height specified as a condition. shall not exceed two (2) stories or thirty-five feet

I-1 buildings must meet front setbacks of 60 feet from tollways, freeways, and limited-access highways; 80 feet from federal or state highways; 60 feet from county highways; and 40 feet from township roads or other roads and streets. front yard

I-1 side yards must generally be 10 percent of lot width, capped at 25 feet; at least 25 feet is required where the lot abuts a residence district, and a side yard adjoining a road must meet the applicable front-yard setback. Two side yards

I-1 buildings must have rear yards of at least 25 feet; where the rear yard abuts a residence district, it must meet the adjoining residence district's rear-yard requirement, which may be greater. All buildings shall have rear yards

Data centers must provide off-street parking and loading facilities, with the applicable requirements and setbacks governed by Division 7. Off-street parking and loading requirements

Within 150 feet of a residence district, all storage associated with an I-1 use must be inside completely enclosed buildings or structures. Elsewhere in I-1, open storage must be enclosed by solid walls or fences at least 8 feet high, no lower than the stored materials, and suitably landscaped. Within one hundred fifty feet

I-1 operations must comply with industrial performance standards governing noise, vibration, smoke and particulate matter, water or other effluent, toxic or noxious matter, fire, glare, heat, and radiation under the Illinois Environmental Protection Act. conform to the Industrial Performance Standards

Exterior lighting for I-1 uses must be shaded when necessary to prevent direct light from shining onto public streets or parks. Exterior lighting fixtures shall be shaded

Data Centers are expressly listed as a special use in the I-1 Industrial District, creating a defined zoning pathway for approval rather than requiring an unlisted-use interpretation.

I-1 buildings and structures may exceed the standard two-story or 35-foot height limit when authorized by special-use-permit conditions, allowing a data center’s height to be approved specifically through the permit.

I-1 zoning permits lots as small as one acre with a minimum 100-foot building-line width, subject to the other applicable district requirements.

I-1 zoning allows buildings and structures, including accessory buildings, to occupy up to 40% of the lot area.

Devices for generating energy, including solar panels and private wind energy conversion systems, are allowed as accessory uses in I-1, subject to the specified setback and waiver requirements.

Lawfully established I-1 uses that later become nonconforming because of an ordinance change may continue under the ordinance’s nonconforming-use rules, providing potential protection against future restrictions.