Illinois Commercial Rent Increases: The Preemption Act

Unlike residential tenancy, where some states cap the percentage a landlord can hike rent, commercial rent increases in Illinois are entirely uncapped and dictated purely by the free market and the lease agreement.

Disclaimer: This guide provides general legal information for educational purposes only and does not constitute legal advice. Always consult a licensed attorney in Illinois for advice specific to your situation. Information last verified: March 2026.

The Rent Control Preemption Act (50 ILCS 825)

Illinois has a long-standing law on the books known as the Rent Control Preemption Act. Simply put, this state statute forbids any city, county, or local municipality in Illinois from enacting any type of rent control.

This applies directly to both residential and commercial properties. Consequently, cities like Chicago or Evanston cannot pass ordinances limiting how much a commercial landlord can charge per square foot or how much they can increase the rent upon lease renewal.

Structuring Commercial Escalations

Because the state will not step in, commercial landlords must proactively structure rent increases into their lease contracts. These built-in increases are essential for protecting the landlord's ROI against long-term inflation.

Common structures used in Illinois commercial leases include:

1. Fixed Step-Ups: The rent increases by a predefined flat dollar amount or a fixed percentage every year of the lease (e.g., $15/sqft in Year 1, escalating by 3% annually).
2. CPI Excalations: The rent increases annually based on an index, typically the Consumer Price Index (CPI), ensuring the revenue outpaces inflation.
3. Percentage Leases: Most common in retail. The tenant pays a "base rent" plus a percentage of their gross sales over a certain threshold (e.g., $5,000/month base rent + 5% of gross sales exceeding $500,000 annually).

Timing and Notice

If a commercial lease is expiring, Illinois law does not mandate a rigid 60-day or 90-day warning before a landlord can demand higher rent for a new term. However, practically all sophisticated commercial leases contain an Option to Renew clause.

This clause typically states the tenant must provide written notice (often 6 to 9 months in advance) of their intent to renew the lease. The exact terms of the renewed rent increase are either stated directly in the clause (e.g., "110% of the previous year's rent") or tied to a vaguely defined "Fair Market Value" appraisal process.

Holdover Tenancy

If a commercial lease expires, the tenant remains in the space, and the landlord continues to accept rent, they become a month-to-month holdover tenant. Under Illinois law, a landlord only needs to provide 30 days' written notice to raise a commercial holdover tenant's rent.

However, a well-drafted commercial lease will contain a severe Holdover Penalty Clause. These clauses specify that if the tenant does not vacate upon expiration, the rent instantly doubles (or jumps to 150%) to penalize the business from overstaying and preventing the landlord from leasing to a new tenant.

How Landager Helps

Landager’s commercial dashboard tracks every complex rent step-up, CPI adjustment milestone, and percentage rent threshold. You'll receive automated notifications exactly when your commercial escalations are due to take effect.

Back to Illinois Commercial Landlord-Tenant Laws Overview.