60-Second Answer: The Five Things That Actually Matter

1. Get the right lease for the right building. Chicago, suburban Cook, and the collar counties have different rules. A stock lease pulled off the internet assumes the landlord knows which one applies and picks correctly.
2. Screen every tenant the same way. The fair housing rule is documented, consistent criteria. Gut-feel decisions are how discrimination claims get built.
3. Run security deposits as a separate accounting system. Receipt, segregated account, calendared interest, itemized return. Most deposit cases are paperwork cases.
4. Document the property before, during, and after. Move-in condition report. Inspections. Move-out walkthrough. Photos stored by date. This is the file that wins or loses every future dispute.
5. Act fast when something goes wrong. Non-payment gets a 5-day notice by day 6. Lease violation gets a 10-day notice. Waiting creates worse options later.

Step One: Know Which Rulebook Applies

Illinois landlord-tenant law is layered. The rules that apply depend on where the property is and how many units it has.

Chicago RLTO (MCC 5-12)

Applies to almost all Chicago rental units. Exceptions exist for owner-occupied 6-flats and below, rooming houses, and a few other categories. Assume RLTO applies unless a lawyer confirms otherwise.

Cook County Residential Tenant and Landlord Ordinance

Covers unincorporated Cook County and most suburban Cook municipalities that haven’t opted out. Similar to RLTO in structure, different in details. Adopted in 2021.

Evanston, Oak Park, and Mount Prospect

Each has its own landlord-tenant ordinance with requirements that deviate from both the RLTO and the Cook County Ordinance.

Illinois state statutes

Security Deposit Return Act, Security Deposit Interest Act, Eviction Act, Retaliatory Eviction Act, and the Residential Tenants’ Right to Repair Act apply statewide, layered on top of any local ordinance.

Collar counties

DuPage, Will, Kane, McHenry, Lake. State statutes apply. No countywide tenant ordinance. This is the simplest regulatory environment in Illinois.

Step Two: The Lease Is the Product

A lease is a five-year contract that governs every dispute. Treat it like the product you’re actually selling.

• Jurisdiction-specific. A lease that’s right for Naperville is not right for Lincoln Park.
• Names all occupants. Spouses, adult children, partners. Anyone staying more than 30 days.
• Clear rent, due date, late fee, grace period. Late fees in Chicago are capped. Elsewhere, reasonable late fees are enforceable if specified.
• Security deposit clauses that match the statute. If the RLTO requires an interest rate be disclosed, the lease discloses it.
• Habitability, repairs, and tenant obligations spelled out. Avoid generic phrases that courts construe against the drafter.
• Attorney-fee clause. Critical. Without it, the landlord eats attorney fees even on a winning case.
• Rules and addenda attached. Parking, pets, smoking, quiet hours, common-area rules. Incorporate, don’t reference vaguely.
• Required disclosures. Lead-based paint (pre-1978 buildings), bed bug history (Chicago), summary of the RLTO or ordinance, radon, mold where applicable.

Stock leases from property-management companies drift. Forms updated in 2018 do not reflect 2021 Cook County changes or 2024 Chicago changes. Review the lease annually against the current rules, or have an attorney do it once and then on a clock.

Step Three: Screen Consistently

Federal fair housing law, the Illinois Human Rights Act, and local ordinances prohibit discrimination based on race, color, national origin, religion, sex, familial status, disability, source of income, marital status, sexual orientation, gender identity, age, ancestry, and military status. Cook County and Chicago add criminal-background restrictions requiring individualized assessment.

The protection against a discrimination claim is a documented, consistent screening process:

• Written criteria. Credit score minimum, income multiple, no open eviction in prior 5 years, reasonable rental history.
• Applied uniformly. Every applicant gets the same form, the same questions, the same criteria.
• Adverse-action notices. Under the Fair Credit Reporting Act, if you deny based on a credit report, you send an adverse-action notice naming the reporting bureau.
• Source-of-income protections. In Cook County and Chicago, refusing Housing Choice Voucher (Section 8) applicants is prohibited.
• Criminal history. Chicago’s “Just Housing” ordinance requires individualized assessment of criminal history, not blanket bans.

Step Four: Run Security Deposits as a System

Security deposit rules trip more landlords than any other category. The fix is a system, not knowledge.

• Receipt at collection, every time
• Segregated, interest-bearing account at an Illinois-based bank
• Calendared annual interest (Chicago properties)
• Move-in condition report signed by the tenant
• Move-out inspection within 72 hours of vacate
• Itemized statement within 21 days (buffer on the 30-day rule)
• Return of balance with accrued interest within 30 days

Detailed breakdown on security deposits is in my Illinois Security Deposit Law for Landlords post.

Step Five: Enforcement When Things Go Wrong

When rent doesn’t come in or the lease gets violated, the biggest mistake is waiting. Every week of inaction makes the situation harder.

Non-payment

5-day notice to pay or quit. Served correctly. If unpaid at expiration, eviction complaint filed. A 5-day notice that’s defective is the most common eviction loss: restart the whole clock.

Lease violation

10-day notice to cure or quit. Used for unauthorized occupants, pets, property damage, nuisance conduct. Requires specificity about the violation.

End of term (holdover)

30-day termination for month-to-month. Less for fixed-term leases approaching expiration (depends on the lease terms).

Squatter or unauthorized occupant

Termination of any license, then eviction. Same court process. Same fee schedule as a standard eviction.

What Landlord Legal Work Costs

The Mistakes That Cost Illinois Landlords the Most Money

• Self-help eviction. Changing locks, removing belongings, cutting utilities. Illegal under 735 ILCS 5/9-101. Damages exposure routinely $5,000 to $15,000.
• Missing security deposit receipt in Chicago. Two-times damages plus attorney fees on the deposit amount.
• Late itemization after move-out. Strict-liability double damages under the state Return Act plus RLTO damages in Chicago.
• Non-uniform screening. Picking the tenant who “felt right” produces discrimination claims even when there was no intent.
• Verbal lease modifications. “We agreed he could pay late this month” becomes “he’s owed a grace period forever” in court.
• No attorney-fee clause. Winning the eviction and still eating your own legal fees because the lease didn’t say otherwise.
• Stale lease forms. Using a form that doesn’t reflect the current ordinance in the current jurisdiction.
• Ignoring the 5-day or 10-day clock. Late notice, defective notice, or no notice at all resets the timeline and adds months.

What I Handle for Landlord Clients

• Lease drafting calibrated to the jurisdiction (RLTO, Cook ordinance, suburban, collar county)
• Annual lease updates as ordinances change
• Security deposit system design: receipts, account setup, calendared interest, itemization templates
• Screening-process documentation and fair-housing compliance
• Evictions across DuPage, Cook, Will, and Kane on the flat-fee schedule
• Deposit-demand defense and settlement
• Property-management-agreement review
• Purchase and sale of rental property (closings and portfolio acquisitions)

Most of my landlord work is recurring. A new lease now saves five evictions over the next five years. That’s the actual math.

Frequently Asked Questions

Do I need a lawyer to be a landlord in Illinois?

Not legally required. Strongly recommended if you own more than one unit, or if your unit is in Chicago or unincorporated Cook County. The ordinances create strict-liability paperwork exposure that an annual review prevents.

Can I use a lease I found online?

Online leases are drafted for average scenarios and become stale fast. Chicago and Cook County rules change annually. A lease that was correct in 2022 is probably not correct now. Have an attorney review at least once and then recheck every 2 years.

How fast can I evict a non-paying tenant?

Collar counties: 30 to 60 days from 5-day notice to sheriff enforcement. Cook County outside Chicago: 45 to 90 days. Chicago: 60 to 120 days. Contested cases add time.

Do I have to accept Section 8 vouchers?

In Chicago and Cook County, yes. Source of income is a protected class. Refusing to consider voucher holders is unlawful. You can still apply income, credit, and rental-history criteria consistently.

What should I do when a tenant complains about a repair?

Respond in writing. Document the repair request, the diagnosis, the work performed, and the invoice. Illinois’s Residential Tenants’ Right to Repair Act and local ordinances give tenants powerful remedies when landlords ignore requests. Written documentation blunts those remedies.

Can a tenant withhold rent for repairs?

In Chicago, yes, under specific conditions in the RLTO. The tenant must give written notice, a cure period must pass, and the withheld amount must be reasonable. Outside Chicago, the state Act gives limited rights but is narrower.

What if I inherited a rental property and never learned the rules?

Call me. Most inherited rentals have legacy leases, unclear deposit accounting, and missing disclosures. A one-hour audit and a clean slate going forward protects the property from the cases that come from the prior owner’s gaps.

Is it worth hiring a property manager?

Depends on unit count and your time. A good property manager handles the day-to-day; an attorney handles the legal work. Neither replaces the other. A property manager using a bad lease template still exposes you to the same liability.