What Is an Estoppel Certificate? A Houston Commercial Tenant’s Complete Guide

by Aug 8, 2026Business Expansion Strategies, CRE Strategies, Healthcare, Tenant Tips

What Is an Estoppel Certificate? A Houston Commercial Tenant’s Complete Guide

By Ryan Hartsell, SIOR, Managing Partner

What Is an Estoppel Certificate? A Houston Commercial Tenant’s Complete Guide

A tenant signing a commercial lease rarely thinks about the estoppel certificate buried in the fine print until a landlord requests one years later, often with a tight deadline attached. For Houston tenants across industrial, office, and healthcare space, that request usually means a building sale or a refinance is underway, and the document carries more legal weight than most tenants realize. An estoppel certificate does not simply repeat what the lease already says.

Once signed, it overrides the lease itself, even in places where it conflicts with the original terms. Understanding what the document covers, why landlords ask for it, and what to check before signing protects a tenant’s rights at a moment when those rights are easy to sign away by accident. The guide below walks through what Houston commercial tenants need to know before an estoppel certificate lands on their desk.

What is an estoppel certificate?

An estoppel certificate is a legal document a commercial tenant signs to verify the most important terms of their lease. Oxford’s tenant representation team reviews many of these documents a year on behalf of clients, and treats the topic as one of the more consequential items in a commercial lease relationship.

The document confirms to a new lender or a new landlord that what the current landlord represents about the lease is accurate. A buyer or lender rarely wants to take the seller’s word alone. The tenant, as the party living under the lease every day, becomes the source of truth.

The term “estoppel” comes from a legal doctrine that prevents a party from later contradicting a fact they already certified in writing. Once a tenant signs an estoppel certificate, that tenant is bound by what the document says, even in places where it departs from the actual lease. That single fact shapes every other section of this guide.

When does a landlord request an estoppel certificate?

Landlords request estoppel certificates in three scenarios.

Refinancing. A lender wants to confirm the primary lease terms before extending a new long-term loan or before the landlord puts more equity into the property. The lender is underwriting the building’s income, and the leases are the income.

Sale of the property. A buyer, and almost always the buyer’s lender, wants written confirmation that the current landlord’s representations hold up. Even a cash buyer without a lender wants that confirmation directly from the tenant instead of taking the seller’s word.

Note or lease assignment. A note or lease assignment triggers this request far less often, arising only when another party assumes the note on the property.

Most commercial leases include a clause obligating the tenant to provide an estoppel certificate within a set response window after the landlord’s request, typically 10 to 30 days. Missing that deadline carries consequences covered later in this guide.

What does an estoppel certificate typically include?

The terms below come up most often in the estoppel certificates Oxford reviews for tenant clients.

  • Lease expiration date. The start date matters less at this point. What matters to a buyer or lender is how much term remains.
  • Current rental rate and escalations. The certificate should reflect the actual rent in place along with any scheduled increases, whether that means flat bumps of fifty cents per square foot or annual percentage increases in the three to four percent range.
  • Security deposit amount. A new landlord inherits the obligation to return this deposit when the lease ends, so the figure has to match what the tenant actually paid.
  • Remaining free rent or abated rent. Any abatement period still owed under the lease carries over to the new owner, who has to honor it.
  • Termination options. Termination rights rank among the most consequential items on the document. A buyer or lender needs to know the years remaining on paper, and whether the tenant holds a right to terminate early, for example, a termination option in year three of a seven-year term.
  • Expansion and renewal options. These matter too, though they typically carry less weight in a buyer’s underwriting than termination rights.
  • Existing landlord defaults or deficiencies. These rank among the biggest issues a review turns up, and one of the items most often revised before a tenant signs.
  • Remaining tenant improvement allowance or unfinished construction items. If the landlord still owes TI dollars or has not completed agreed-upon construction, the certificate needs to say so.

The certificate also typically identifies the tenant and the property address at the top of the document, along with any side letters or amendments that modify the original lease.

What are the risks for tenants who sign without reviewing?

The central risk runs through everything else in this guide. The estoppel certificate overrules the original lease and every amendment to it once the tenant signs.

One case from Oxford’s practice shows how quickly this goes wrong. A client’s draft estoppel certificate stated that no termination option existed, when the lease actually included one. The same draft stated that no landlord defaults or deficiencies existed, while the client was in the middle of a dispute with the landlord over operating expense escalations, a dispute the tenant later won. Had the client signed the certificate as drafted, the tenant would have given up the termination option permanently and lost the right to dispute the operating expense charges going forward. Oxford caught both errors and had the client correct the document before signing.

That example points to the pattern behind most estoppel disputes. A document that omits or misstates something the tenant currently relies on, whether that is an unresolved landlord obligation, an option right, or an ongoing disagreement over charges, becomes difficult to unwind once signed. A tenant who signs without checking each line against the original lease has no way to know what got left out.

These errors rarely come from bad intent. Property management companies process a high volume of estoppel certificates, and mistakes happen because of that volume and the level of detail required, not because anyone is trying to take advantage of the tenant. That distinction matters for how a tenant should approach the review, with care rather than suspicion.

What should a Houston tenant do before signing?

A short checklist covers what matters most.

  1. Run it by your tenant rep agent. A broker who represents the tenant, not the landlord, reviews these documents regularly and knows where the common mistakes hide.
  2. Compare every line against the original lease. Pull the primary lease and every amendment, and check the rent figures, escalation dates, and any abatement periods against what the estoppel certificate states.
  3. Look for what is missing, not only what is included. Tenants overlook this detail more than any other. Important lease clauses sometimes get left off the certificate entirely, and a tenant who only checks the items that are present will miss that gap.
  4. Mark up anything that does not match. If a term in the estoppel certificate contradicts the lease, correct it on the document rather than signing it as presented.
  5. Confirm your option rights. Renewal options, expansion rights, and termination rights should appear accurately, along with whether the tenant has already exercised any of them.

Does Texas law require tenants to sign estoppel certificates

No Texas statute requires a tenant to sign an estoppel certificate. The obligation comes entirely from the lease document itself.

Most commercial leases in Houston include an estoppel clause, and the details buried inside that clause carry real weight. Many leases stipulate that if the tenant does not respond within the stated window, the certificate is deemed accurate as drafted, or the landlord gains the authority to sign it on the tenant’s behalf.

That structure leads some tenants to consider refusing to sign altogether. Refusing does not stop the deadline from passing, and it only leaves the landlord free to decide the outcome instead. The stronger approach runs the opposite direction: review the document, respond within the deadline, and put any inaccuracies on record.

Estoppel certificate vs. estoppel agreement: is there a difference?

In commercial real estate, “estoppel certificate” and “estoppel agreement” refer to the same document in the vast majority of everyday use, and the terms get used interchangeably. “Estoppel letter” and “tenant estoppel” describe the same thing as well.

Some practitioners draw a narrower technical distinction. In that usage, “estoppel agreement” describes a document with mutual certifications, meaning both the landlord and the tenant sign and certify facts to each other, while “estoppel certificate” refers specifically to a one-way certification from the tenant to a buyer or lender. In practice, the large majority of commercial estoppels in the Houston market are tenant-only certifications regardless of which term appears on the document.

Tenants sometimes confuse the estoppel certificate with a related but separate document called a subordination, non-disturbance, and attornment agreement, or SNDA. A lender requesting refinance documentation often asks for both at the same time. The estoppel certificate confirms the facts of the lease, while the SNDA addresses what happens to the tenant’s lease if the landlord defaults on the mortgage. The two serve different purposes even though they tend to arrive in the same request.

How Oxford Partners helps Houston tenants navigate estoppel certificates

Oxford reviews estoppel certificates as part of its ongoing advisory relationship with tenant clients, not as a one-time transaction service. Because Oxford represents tenants and buyers exclusively and never represents landlords, the firm’s only obligation when reviewing an estoppel certificate belongs to the tenant, never to the landlord requesting it.

If you have received an estoppel certificate and are unsure how to respond, contact Oxford Partners before signing.

Frequently asked questions

What is an estoppel certificate in commercial real estate?
An estoppel certificate is a signed document in which a commercial tenant confirms the current terms of their lease, including rent amounts, lease dates, and any unresolved landlord obligations. The document is legally binding once signed, so the tenant cannot later contradict what they certified.
Can a landlord require a tenant to sign an estoppel certificate?
Most commercial leases include a clause requiring the tenant to provide an estoppel certificate within a set number of days of the landlord’s written request. If the lease includes that clause, the tenant is contractually obligated to comply. If no such clause exists, the landlord cannot compel the tenant’s signature, since Texas law does not create this obligation on its own.
What happens if a tenant refuses to sign an estoppel certificate?
If the lease includes an estoppel clause and the tenant does not respond within the deadline, many leases allow the landlord to certify the terms on the tenant’s behalf. That leaves the tenant bound by a document they never reviewed. Tenants should respond within the deadline in every case, even if the response includes corrections.
What is the difference between an estoppel certificate and an estoppel agreement?
The two terms describe the same document in commercial real estate and get used interchangeably in most everyday use. “Estoppel letter” is a third variation that means the same thing.
Should a tenant have their broker review an estoppel certificate before signing?
Yes. An estoppel certificate can waive rights a tenant did not intend to give up, particularly around unresolved landlord obligations or option rights like termination and renewal. A tenant rep broker compares the estoppel certificate against the original lease and every amendment before the tenant signs anything.

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