The rent is late again, the calls aren't being returned, and you're staring at a mortgage that doesn't care about your tenant's excuses. Take a breath: in Missouri you have clear, reliable tools to recover both your space and the money you're owed. A commercial tenant who stops paying is in breach of contract, and the law gives you a court process built for exactly this. The key is to move deliberately and through the right channel, because the fastest way to turn a simple rent problem into an expensive lawsuit against you is to take matters into your own hands.
So before you do anything, slow down for one beat. Your first move is not to change the locks — it's to read your lease, then choose the correct court action. Do those two things in order and you protect your judgment, your property, and yourself.
Start with the lease — it controls everything
A Missouri commercial lease is a negotiated contract, and unlike residential tenancies it carries few statutory protections for the tenant. Courts generally enforce it as written. That works in your favor, so read it closely before you act.
- Default and cure provisions. Find out what counts as a default and whether the lease gives the tenant a notice-and-cure window (often a set number of days to pay after written notice). You usually must honor that window before moving forward.
- Notice requirements. Note exactly how and where notice must be delivered. A defective notice can sink an otherwise solid case, so follow the lease to the letter.
- Late fees and interest. Most leases let you add late charges and interest to what's owed. Calculate them.
- Acceleration. Many leases let you accelerate — demand the entire remaining rent — once the tenant defaults. Check whether yours does.
- Security deposit, letter of credit, or guaranty. You may be able to apply a security deposit or draw on a letter of credit against the arrears. And if an owner signed a personal guaranty, you can pursue that individual directly for the unpaid rent.
Read the guaranty and any amendments too. The document, not your frustration, decides your remedies.
Choose the right court action
Missouri gives a landlord chasing unpaid rent two main statutory paths, and picking the correct one matters.
- Rent and possession (Chapter 535). This is the action built for a tenant who is still in the lease term but not paying. It lets you recover both possession of the space and a money judgment for the unpaid rent. The catch: the tenant can forestall eviction by paying the rent and court costs due — the "pay and stay" right — before judgment. For a nonpaying-but-still-in-term commercial tenant, this is usually your action.
- Unlawful detainer (Chapter 534). This is a pure possession action used after the tenancy has ended — for example, after the lease term expires or you've properly terminated for default and the tenant holds over. It can support double damages for the holdover period, but it generally carries no pay-to-stay cure once the tenancy is properly ended.
So which fits you? If your tenant is mid-term and simply behind, rent and possession is the natural choice — you get your money and your possession claim in one action. If you'd rather have the space back with certainty, you terminate the lease correctly first and then bring unlawful detainer — but that route lives or dies on a clean termination, so the notice has to be right.
Do not change the locks (the self-help trap)
This is the single most dangerous move a Missouri commercial landlord can make. Even if your lease appears to allow self-help — changing the locks or seizing property without a court order — doing it is risky. Any re-entry must be peaceable, and a wrongful lockout or a breach of the peace can expose you to serious liability.
- The damages can dwarf the rent. Lock a tenant out of its inventory, equipment, or records and you may be defending claims for lost profits, conversion of the trapped property, and business interruption. A landlord chasing $12,000 in back rent can end up facing a six-figure claim.
- The safe route is the court. A statutory eviction produces a court order and a sheriff-supervised removal. It feels slower, but it's the path that actually protects you.
Resist the urge to "send a message" by killing the power, removing doors, or hauling out the tenant's property. None of that is a safe first move in Missouri. Let the court do the removing.
File, then pursue the money
Once you've followed the lease and chosen your action, move promptly — the procedural windows are short.
- Serve the required notice. Whatever the lease and statute demand, deliver it correctly and keep proof.
- File in the right county. Bring your rent and possession or unlawful detainer action in the appropriate Missouri court for where the property sits.
- Ask for everything you're owed. Unpaid base rent, late fees, interest, and — where the lease allows — attorneys' fees and accelerated rent.
- Pursue the guarantor. If an owner personally guaranteed the lease, name them. A guaranty lets you collect the company's unpaid rent from the individual, and that's often where the recoverable money actually is.
- Apply your security. Credit any security deposit or letter-of-credit draw against the balance, as the lease permits.
A money judgment is only as good as your ability to collect it, which is exactly why the guaranty and the deposit matter so much.
Re-let the space and mitigate your damages
If your tenant abandons the premises or you regain possession, Missouri generally expects you to take reasonable steps to re-let rather than let the space sit empty and bill the tenant for the full remaining term.
- Market the space. Do what a reasonable landlord would to fill comparable space on commercially reasonable terms. You don't have to prioritize it over your other vacancies, but you do have to try.
- Sue for the deficiency. You can still recover the shortfall — the difference between the lease rent and what a reasonable re-letting brings — plus your reasonable re-letting costs.
- Document every effort. Listings, showings, offers, and rejections. Mitigation fights are won with records, and a tenant hoping to cut the bill must show you ignored a suitable replacement.
- Reserve your rights. If you re-let, do it expressly for the tenant's account and reserve your rights in writing. Re-letting on your own account with no reservation can be treated as accepting a surrender — which cuts off your right to chase the departed tenant.
Mitigation isn't a loophole for the tenant; it's a discipline that, done right, both reduces the loss and preserves your claim for what's left.
Frequently Asked Questions
My commercial tenant is behind on rent but still in the lease term — which action do I file?
A rent and possession action under Chapter 535 is usually the fit. It recovers both possession and a money judgment for the unpaid rent in one proceeding. Be aware the tenant can avoid eviction by paying the rent and costs due before judgment.
Can I just change the locks on a tenant who won't pay?
It's risky, and it isn't your first move. Even when a lease seems to allow self-help, a wrongful lockout or breach of the peace can expose you to liability for wrongful eviction and conversion of the tenant's property. The reliable, protected route is a statutory eviction that ends in a sheriff-supervised removal.
What's the difference between rent and possession and unlawful detainer?
Rent and possession (Chapter 535) is for a tenant still in term who isn't paying; it recovers possession plus unpaid rent but lets the tenant pay to stay. Unlawful detainer (Chapter 534) is used after the tenancy has ended or for a holdover, carries no pay-to-stay cure, and can support double damages for the holdover period.
Do I have to try to re-rent the space if the tenant leaves?
Generally, yes. Missouri expects you to make reasonable efforts to re-let abandoned commercial space and mitigate your damages. You can still recover the rent shortfall and reasonable re-letting costs, but a landlord who makes no effort to re-rent may see its recoverable damages reduced.
Can I collect the unpaid rent from the business owner personally?
You can if an owner signed a personal guaranty, which most landlords require. The guaranty makes the individual responsible for the tenant's obligations, so unpaid rent can be collected from them directly. The reach depends on the wording — whether it is unlimited, capped, or "good guy" limited.
Can I seize my tenant's equipment or inventory for the back rent?
Don't treat that as a self-help option. Missouri's safe remedies are the ones in your lease plus the court actions; grabbing or holding a tenant's property risks a conversion claim that can far exceed the rent. Recover what you're owed through a judgment and any security or guaranty the lease provides.
Legal Disclaimer
This guide provides general legal information about Missouri law and is not legal advice. It does not create an attorney-client relationship. The outcome of any commercial rent dispute depends almost entirely on your specific lease, guaranty, and facts; consult a qualified Missouri attorney before sending a notice, choosing an eviction action, or taking back possession.