In Cook County You Can't Ask a Renter About Their Record Until After You've Offered Them the Unit. Forty Miles West, Aurora Won't License You Until You've Run the Check on Everyone Over 18.
Same metro. Same drive time as Evanston to Joliet. Two rulebooks that point in opposite directions.
Most investors buying in Chicagoland spend their diligence on the spreadsheet. Purchase price, rents, taxes, the roof. Fair enough — that's where the money is. But the thing that quietly costs people money out here isn't the spreadsheet. It's that the rules governing your rental change at the village line, and nobody sends you a memo when you cross it.
GC Realty & Development, a property management firm that operates across the region, puts it bluntly: there are more than 180 suburbs around Chicago, and by their count well over half have some form of rental licensing. Some require a license and no inspection. Some require an annual inspection on top of the fee. Some split the rules between condos and single-family homes. Some have nothing at all. Every village writes its own.
Here's the map, layer by layer.
Layer 1: Illinois, which now reaches into every lease you write
Two statewide items matter to anyone signing leases in 2026.
The Summary of Rights for Safer Homes. Since January 1, 2026, Illinois requires every written residential lease and renewal to carry the state-issued summary as the first page. Not an attachment, not an addendum in the back. Page one.
The Security Deposit Return Act. Since January 1, 2024, it applies to residential landlords who take deposits without the old five-or-more-unit threshold. If you bought a single-family rental thinking the deposit rules didn't reach you, they do.
Illinois also tightened lease fee disclosure effective July 1, 2026 — covered elsewhere on this blog alongside the squatter and deed-fraud changes.
Layer 2: The county — and this is where Chicagoland splits in half
Cook County has two ordinances that most new investors have never heard of.
The Residential Tenant Landlord Ordinance (RTLO) passed in January 2021 and took effect June 1, 2021. It covers almost all rental units in suburban Cook County. The operating details:
Security deposits capped at 1.5 times monthly rent, held in a separate account, receipt required, returned within 30 days with an itemized list
Late fee capped at $10 if rent is $1,000 or less; above that, $10 plus 5% of the amount over $1,000
60-day notice for non-renewal. 5-day notice for non-payment, with a one-time right to pay and stay after filing. 10-day notice with a right to cure for lease violations. 2-day notice before entry
Heat from September 15 through June 1: at least 68 degrees from 8:30 a.m. to 10:30 p.m., 66 degrees overnight
Bedbugs treated within 10 days of notice, with written pest-control records kept three years
You must attach the RTLO summary to the lease. Miss it, fail to fix it within two days of written notice, and the tenant can terminate, recover actual damages plus $200 and attorney's fees
The exemptions are the part worth memorizing. Owner-occupied buildings with six units or fewer are out (except the anti-lockout rules, which apply to every unit with no exceptions). So is a single-family home or condo where the owner rents only that one property and the owner or an immediate family member lived there within the past 12 months. That second one expires quietly — rent it three years running and you're no longer exempt.
One more thing about the RTLO: Cook County's Commission on Human Rights is not the enforcement agency. It's enforced through a private right of action, meaning the consequence arrives as a lawsuit from your tenant, not a letter from the county.
The Just Housing Amendment is the other one, effective January 1, 2020, and it covers all of Cook County — city and suburbs. It governs how criminal history can be used in tenant screening:
A question about criminal records should not appear on the application at all, and shouldn't appear in listings or ads
Screening runs in two steps: prequalification first (credit, income, employment, references), and only after a conditional offer can criminal history be checked
The lookback is three years from the date of conviction. Anything older cannot be the basis for denial. Arrests without convictions cannot be used at all
If something appears inside the three years, a blanket denial isn't allowed — you must perform a documented individualized assessment weighing nature, severity, recency, and evidence of rehabilitation
Current sex offender registration requirements sit outside the lookback
The JHA does not require you to run a background check. It governs what you may do with one.
Now the other half of Chicagoland. DuPage, Will, Kane, Lake, and McHenry counties have no county-level equivalent to either ordinance. State law governs: 30 days' notice on month-to-month, 60 days on year-to-year, and that's largely it at the county level. Which does not mean fewer rules — it means the rules live one level down.
Layer 3: The municipal tenant ordinances
Chicago has its own RLTO, and the City Council is in the middle of rewriting it. The mayor's revised Protecting Renters Ordinance was headed to a housing committee vote on September 16 with a full Council vote targeted for September 23. I broke down both versions here.
Evanston and Mount Prospect have their own ordinances and are carved out of the Cook County RTLO. Oak Park has its own Residential Tenant and Landlord Ordinance too — though sources disagree on whether Oak Park is formally carved out of the county ordinance or layered underneath it. Illinois Legal Aid Online lists Oak Park among the exclusions; several property-management summaries list only Chicago, Evanston, and Mount Prospect. If you're buying there, that's a question for a real estate attorney, not a blog post.
Layer 4: Licensing and inspections, where the actual dollars are
This is the layer that shows up in your operating expenses. A sample of what the fee schedules look like right now:
Waukegan — rental license priced per unit at $60, expiring annually with renewal due December 31, and re-inspection when a code officer calls for it
Aurora — licensing required for every non-owner-occupied unit, two-family, and multi-family building whether occupied or vacant. Fees start around $90 per property and scale with unit count. The license year runs September 1 to August 31. Operating without one exposes you to fines up to $1,000 per unit per day
Elgin — the city reports 4,218 active rental licenses covering more than 12,188 individual units, all on one-year terms, with inspection scheduled once the renewal fee is paid
Joliet — a Rental Dwelling Registration and Certification System under Municipal Code Chapter 8, Division 15. A 2023 amendment closed most of the old exemptions. If you live more than 30 miles from city limits, you must name a local agent
West Chicago — annual rental license plus a scheduled annual inspection, with a deed copy required on the initial application
And Aurora goes further than most. To get licensed, the application must include proof of a crime-free lease addendum and a background check verification affidavit for every resident 18 and older. Owners or managers who haven't been through the city's own Crime Free Multi-Housing Seminar are required to attend it, and Aurora does not accept certification from other municipalities. Renewal applications require full names and contact information for every occupant 18 and up, plus a total occupant count including minors.
So: in Cook County, asking about criminal history before a conditional offer is prohibited. In Aurora, running the check on everyone over 18 is a condition of your license. Both are true right now, in the same metro area. If you own in both places and run one screening process across your portfolio, one of those two properties is out of compliance.
The inspection fight nobody outside the industry noticed
In July 2025, the Illinois Appellate Court's Second District decided DPH Aurora Properties, LLC v. City of Aurora, 2025 IL App (2d) 240540, out of Kane County. A landlord with a 21-unit building and one of its tenants challenged the city's rental ordinances on Fourth Amendment, privacy, and equal protection grounds.
The court affirmed in part and reversed in part. The facial constitutional challenges to the background-check and crime-free-addendum requirements did not survive. But the court found a genuine question of fact on one as-applied claim: the city knew two weeks ahead of a scheduled inspection that not every resident had consented, then imposed a $150 "missed inspection" fine anyway. Citing Camara v. Municipal Court, the court noted it is improper to sanction landlords or tenants for exercising the Fourth Amendment right to refuse entry. That piece went back to the trial court.
The practical read for an investor: a licensing inspection generally depends on someone consenting to let the inspector in, and your tenant is the one who decides. How your municipality handles a refusal is a question worth asking before you own the building.
The honest case on both sides
Why cities do this. Licensing programs give a village a current list of who owns what, a contact for emergencies, and a mechanism to catch unsafe conditions in older housing stock before they become fires or displacements. In towns where absentee ownership is common, that list is often the only tool a small code department has.
Why owners object. The fees, the annual visits, the inconsistency from inspector to inspector, and penalties that can run per unit per day. Landlord groups also argue that requirements built around tenant screening push cost and legal risk onto owners for outcomes they don't control — which is roughly the argument at the center of the Aurora litigation.
Neither side is inventing its numbers. Where you land probably depends on which side of the transaction you're on.
The 20-minute check before you write an offer
Call the village. Building or code department. Ask three questions: Do you require a rental license? Is there an annual inspection? What's the fee, per property or per unit?
Ask what happens at transfer. Some towns require the license before you can rent, some before you can close, some require a separate point-of-sale inspection on the seller's side entirely.
Ask about the crime-free program. Is it mandatory? Does it require a specific lease addendum, a training class, or background check affidavits? Will the town accept certification you earned somewhere else?
Confirm the county layer. Cook, or a collar county? Suburban Cook means the RTLO and the Just Housing Amendment. Everywhere else means state law plus whatever the village adopted.
Check the exemption you think you have. Owner-occupied six-or-fewer and the one-property single-family carve-out both have conditions that expire.
Get the inherited leases and deposits in writing. You are stepping into someone else's compliance history, including how they've been holding deposits.
Put the annual cost in the model. License fee, inspection fee, re-inspection fee, and a realistic line for whatever the inspector flags. On a small building it's rarely a deal-breaker. It's also never zero.
Have a real estate attorney review your tenant criteria before you use it — and remember federal and Illinois fair housing law applies in every one of these towns regardless of what the local rulebook says.
Where this fits with the rest of the math
Licensing and inspection costs aren't the biggest line on a Chicagoland rental. Taxes, insurance, and debt service are. I walked through what those actually do to a building in the two-flat breakdown, and what the Cook County assessment cycle does to your tax line in the Kaegi-to-Hynes piece.
But compliance costs have a nasty property the others don't: they're the ones that turn into fines. A tax bill you underestimated makes the deal worse. An unlicensed building in a town that fines per unit per day makes it worse fast.
If you're buying or selling a Chicagoland rental
On the buy side, I'll pull the actual tax bill before you write the offer, tell you which layer of rules that specific address sits under, and give you the real rent comps instead of the seller's projections.
On the sell side, I list at 1.25% — about $5,000 on a $400,000 building — with full service: professional photography, 3D Matterport tours, and full online marketing. Find your own buyer and you pay me nothing under my Zero Commission Clause, and you can cancel anytime. Thinking about trading up rather than cashing out? Ask me about a 1031 exchange.
Call or text 312.882.9797.
Fees, ordinances, and enforcement practices change. Figures here reflect public sources available September 14, 2026 — verify current requirements directly with the municipality before you rely on them. I'm a licensed Illinois real estate broker, not an attorney, lender, or tax advisor.
Sources
Cook County Government — Residential Tenant Landlord Ordinance FAQ and ordinance text, cookcountyil.gov/rtlo
Cook County Commission on Human Rights — Just Housing Amendment landlord FAQ, screening process guide, and JHA flyer
Illinois Legal Aid Online — Landlord-tenant laws FAQ; Cook County housing rights for people with a criminal record
City of Waukegan — Rental License, waukeganil.gov
City of Aurora — Rental Licensing Program, Residential Property Registration form, and Crime Free Multi-Housing Program materials; Aurora Code of Ordinances § 12-102 (Property Maintenance Code § 113.1)
City of Elgin — Rental License program page, elginil.gov
City of West Chicago — Residential Rental Licensing, westchicago.org
City of Joliet Municipal Code, Chapter 8, Division 15 — Rental Dwelling Registration and Certification System
DPH Aurora Properties, LLC v. City of Aurora, 2025 IL App (2d) 240540 (July 22, 2025); Camara v. Municipal Court, 387 U.S. 523 (1967)
GC Realty & Development — rental licensing overview for Chicago-area landlords
Illinois Summary of Rights for Safer Homes Act lease requirement, effective January 1, 2026; Illinois Security Deposit Return Act
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