Lease Acceleration Clause
in Your Lease
What it actually means, what Illinois law says, what's specific to Chicago - and exactly what to do. In plain English.
Quick Summary - What You Need to Know
- 735 ILCS 5/9-213.1 requires your landlord to take reasonable measures to mitigate damages, and has since January 1, 1984.
- Chicago's RLTO defines abandonment at section 5-12-130(e): 21 days gone with rent unpaid and property removed, or 32 days gone with rent unpaid.
- RLTO section 5-12-140 voids lease terms that waive your RLTO rights, confess judgment, or make you pay the landlord's attorney fees.
- The statute sets no deadline for re-renting, so whether your landlord's effort was reasonable gets decided case by case.
- Miami landlords can legally sit on an empty unit and bill you monthly; Illinois gives you a mitigation defense Florida renters lack.
Understanding the Lease Acceleration Clause
A lease acceleration clause says that the moment you default - miss rent, move out early, break a term - the entire remaining rent for the whole lease becomes due at once. On a Chicago apartment at $1,800 a month with eight months left, that's a $14,400 demand triggered by one bad payment.
It matters here because Illinois puts a counterweight against that clause. 735 ILCS 5/9-213.1 forces your landlord to take reasonable measures to cut the damages they can recover, so the number printed in your lease and the number a court would actually award are usually two very different figures.
What renters assume
Renters see the full remaining balance spelled out in the acceleration clause and assume it's a real, enforceable bill they either pay or run from.
What is actually true
That number is a ceiling, not a verdict. Because 735 ILCS 5/9-213.1 makes your landlord take reasonable measures to re-rent, the recoverable amount shrinks by whatever the next tenant pays.
Illinois sits in the protective half of that chart, though not at the top. Texas and New York go further and explicitly void any lease clause waiving the mitigation duty; the Illinois statute doesn't spell that out. What backs Chicago renters up is local - RLTO section 5-12-140 voids waivers of your RLTO rights outright.
Plain English Version
It's like quitting a gym and getting billed for all twelve remaining months on the spot, except Illinois makes the gym try to sell your spot to someone else first. Whatever they collect from that next person comes off your bill.
Rent Acceleration Clause Example - What the Wording Looks Like in Chicago, IL
The sample clause below is real lease language - a court quoted it word for word, and then ruled on it. What the judge decided is at the bottom of this block.
Find the equivalent paragraph in your own lease and read the two side by side. The wording will differ; the moving parts rarely do.
The three sentences the opinion sets out, in order. The lease paragraph continues past them with a sentence about late fees and interest on accelerated amounts, not reproduced here:
If any monthly installment under this agreement is not paid when due and remains unpaid after a date specified by a notice to Tenant, the entire principal rent amount owed for the full lease term shall at once become due and payable at the option of the Landlord and judgment may be had for all said amounts due. The foregoing provision shall not relieve the Landlord of its obligation to mitigate damages. In the event the rental premises is re-rented to another for full value prior to expiration of the lease term, Landlord shall file Notice of Partial Satisfaction of any judgment entered to the extent of the third party rental agreement.
[…]
Quoted from the published opinion in Summers v. Crestview Apartments, 2010 MT 164, 357 Mont. 123, 236 P.3d 586 (No. DA 09-0489). Judicial opinions are not subject to copyright; the lease language is reproduced in limited part for commentary under 17 U.S.C. § 107.
“and remains unpaid”
Unpaid rent is only half of what Chicago's ordinance needs before a unit counts as abandoned. The other half is time. RLTO § 5-12-130(e) defines abandonment as 21 days of absence with rent unpaid and the tenant's property removed, or 32 days of absence with rent unpaid. Falling behind while still living there meets neither limb, and the distinction is worth holding on to, because much of what this paragraph lets a landlord do next is written for a tenant who has gone.
“and judgment may be had”
Read this next to RLTO § 5-12-140, the Chicago provision most likely to reach a clause like this one. It voids lease terms that waive RLTO rights, that confess judgment on the tenant's behalf, and that make the tenant pay the landlord's attorney fees. A paragraph contemplating that a judgment may follow is not itself a confession of judgment - it assumes a suit - but it sits close enough to that line that the rest of the lease is worth reading for who is agreeing to what.
“of its obligation to mitigate damages”
This is the statewide rule restated in the lease's own words. 735 ILCS 5/9-213.1 requires a landlord or the landlord's agent to take reasonable measures to mitigate the damages recoverable against a defaulting lessee, so a demand for the entire remaining rent is cut down to what re-renting could have recovered. The statute fixes no deadline and no procedure, which means reasonableness is judged case by case on what this landlord did with this unit.
“of any judgment entered”
A Notice of Partial Satisfaction is how a judgment for the whole term gets reduced after the unit is earning again, and in Illinois the reduction is not a courtesy: the mitigation duty is what forces the number down. It is worth seeing the alternative. In Pennsylvania there is no mitigation statute, and Stonehedge Square Ltd. Partnership v. Movie Merchants, Inc., 715 A.2d 1082 (Pa. 1998), holds that a non-breaching landlord whose tenant abandons in breach has no duty to mitigate. The same paragraph produces a very different bill on the two sides of that line.
The Montana Supreme Court struck this paragraph down, and its conclusion is one sentence: “Thus, we conclude that the accelerated rent provision is unconscionable and therefore unenforceable.” The tenants had moved out of their apartment on October 13, 2006, and Crestview answered with a Statement of Deductions from the Security Deposit charging rent through the end of the lease in June - $6,505.75 billed against a $2,170 deposit. Two reasons carried the court. Acceleration undermines the landlord's duty to mitigate and reduces the incentive to re-rent promptly, because a landlord already holding a judgment for the whole term has little reason to fill the unit. And Crestview drafted the lease while these tenants had no meaningful choice and no opportunity to negotiate any of it. The case was reversed and remanded, and two justices wrote separately - their objection being that the majority had gone as far as treating acceleration clauses as unenforceable in themselves. So read the holding narrowly, as the majority wrote it: this provision, in this residential lease, unconscionable and unenforceable. It is a Montana decision and it binds no other state's courts. What travels is the reasoning, and the reasoning is about mitigation - which is exactly the question the statute in your own city's decode answers.
One court, one lease, one state. That answer is not automatically yours, and your lease may be worded to land differently. Use this to know what to look for and what to ask - your state's tenant hotline or a local tenant attorney can answer it for your document.
Illinois Law on Lease Acceleration Clause
- 735 ILCS 5/9-213.1 requires a landlord or agent to take reasonable measures to mitigate damages recoverable against a defaulting lessee.
- The statute sets no deadline or procedure, so reasonableness is judged case by case.
- Because damages must be mitigated, a clause demanding the entire remaining rent is cut down by what re-renting could recover.
- The duty applies statewide and has been in force since January 1, 1984.
735 ILCS 5/9-213.1 - statutes change; verify the current text for your situation.
735 ILCS 5/9-213.1 is short and does one job: your landlord or their agent must take reasonable measures to mitigate the damages recoverable against a defaulting tenant. In practice that means listing the unit, showing it, and renting it at a fair price - not parking it and running the meter. The duty has applied statewide since January 1, 1984.
What the statute doesn't give you is a clock. There's no deadline and no required procedure, so reasonableness gets argued case by case, which is exactly why your own evidence of what the landlord did or didn't do carries so much weight. Contrast Florida, where Fla. Stat. § 83.595 lets a Miami property manager stand by and do nothing while holding you liable for rent as it comes due - Illinois takes that option off the table.
Illinois Tenant Protections
Your landlord has to take reasonable measures to mitigate the damages recoverable against you, so an accelerated balance gets reduced by what re-renting brings in. Because damages must be mitigated, a clause demanding the entire remaining term is cut down to what the landlord could not reasonably have avoided losing. Inside Chicago, RLTO section 5-12-140 voids lease terms that waive your RLTO rights, confess judgment against you, or stick you with the landlord's attorney fees.
What's Specific to Chicago
Figures are the state rule, or the stronger city ordinance where one exists. Verify the current law for your own situation before relying on it.
Chicago genuinely adds protection on this one. The RLTO defines abandonment at section 5-12-130(e) - 21 days absent with rent unpaid and your property removed, or 32 days absent with rent unpaid - so nobody gets to call your long work trip an abandonment and accelerate the balance. Section 5-12-140 separately voids lease terms waiving RLTO rights, confessing judgment, or making you cover the landlord's attorney fees.
Chicago's rental calendar does the rest of the work for you. Turnover clusters hard around May 1 and October 1, and a Logan Square or Lakeview unit that hits the market in spring rarely sits empty - which makes a claim of months of unrecoverable rent tough to defend. A January vacancy is the landlord's stronger case, so screenshot the re-listing either way.
Fair leases state that your balance drops by rent collected after re-rental. 735 ILCS 5/9-213.1 already requires that, so putting it in writing costs your landlord nothing.
A clause turning a single late month into the whole remaining term is the harshest version of this term. Ask for it struck or capped before you sign.
A defined buyout with a set dollar amount beats an open-ended acceleration demand, because you know your exact exposure before anything goes wrong.
Inside Chicago that term is void under RLTO section 5-12-140, along with any clause confessing judgment or waiving your RLTO rights.
Sources
The law this guide relies on, and where to read it. Statutes change, so confirm the current text before you act on it.
- 735 ILCS 5/9-213.1, read on codes.findlaw.com. FindLaw marks its copy of this section current as of January 1, 2025; Illinois publishes the official text at www.ilga.gov, which refuses connections from our build machine.
Red Flags to Watch Out For
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Full term due on one default
One missed payment converting into every remaining month is the most aggressive form of this clause. Illinois' mitigation duty under 735 ILCS 5/9-213.1 still applies, but you'll be arguing it.
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No re-rental credit language
A lease silent on crediting new rent doesn't erase the statute, but it signals a property manager who plans to bill the full balance and dare you to fight.
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Waiver of your RLTO rights
Any Chicago lease term where you agree to give up RLTO protections is void under section 5-12-140. Treat it as a warning about the whole document.
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Confession of judgment clause
This lets a landlord take judgment against you without a hearing. RLTO section 5-12-140 makes it void in Chicago, and it belongs in no residential lease anywhere.
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Abandonment defined too loosely
RLTO section 5-12-130(e) sets the line at 21 days gone with rent unpaid and property removed, or 32 days gone with rent unpaid. Anything shorter doesn't match the ordinance.
Your Rights as a Chicago Tenant
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Landlord must try to re-rent
735 ILCS 5/9-213.1 requires reasonable measures to mitigate the damages recoverable against a defaulting tenant. Doing nothing and billing you month after month isn't an Illinois option.
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Accelerated balance gets cut down
Because damages must be mitigated, a demand for the entire remaining term shrinks by what re-renting could reasonably have produced. The clause names a ceiling, not a judgment.
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RLTO waivers are void
Section 5-12-140 voids Chicago lease terms that waive RLTO rights, confess judgment, or make you pay the landlord's attorney fees - having signed one changes nothing.
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A real abandonment definition
RLTO section 5-12-130(e) puts abandonment at 21 days away with rent unpaid and property removed, or 32 days away with rent unpaid - not a landlord's guess.
What To Do - Step by Step
Find the acceleration language
Search your lease for "accelerate," "entire balance," or "all remaining rent." Copy the exact wording out - everything after this depends on what it actually says.
Check whether the RLTO covers you
Chicago's ordinance doesn't reach every building, and small owner-occupied properties sit outside it. If you're covered, sections 5-12-130(e) and 5-12-140 are your strongest cards.
Demand an itemized statement
Ask in writing for a line-by-line breakdown: months claimed, re-rental efforts made, and any rent collected from a new tenant. Never accept a lump-sum number.
Track the re-listing yourself
Screenshot the listing sites and the building's own page the week after you leave. Proof that the unit re-rented fast is your mitigation defense.
Send a mitigation letter
Cite 735 ILCS 5/9-213.1, state that damages must be mitigated, and ask what reasonable measures were taken. Keep it factual, dated, and short.
Get a tenant attorney involved
A demand for a full year of rent justifies one hour of legal time. Chicago legal aid and tenant-rights hotlines handle acceleration disputes constantly.