An estoppel certificate is a tenant's signed statement of the facts of its lease, made for a buyer or a lender of the building. Once that buyer or lender relies on it, the tenant cannot later claim different facts against it.
The US House of Representatives rents district offices for its members. Its guidance puts it plainly: "An estoppel certificate establishes the current status of the lease terms for a third party." The House adds that a landlord or building owner generally asks for one when "selling the building or refinancing the mortgage" (US House, estoppel certificate).
A buyer prices a building on its rent, and a lender sizes a loan on the same rent. Both start from the rent roll, the landlord's own list of its leases. The certificate lets each tenant confirm or correct its line. Bank examiners expect to find it. The Office of the Comptroller of the Currency (OCC) supervises US national banks. It lists "copies of all leases and executed tenant estoppels" among the documents banks typically keep in a loan file (OCC, commercial real estate lending).
Estoppel is a legal bar. Cornell Law School's legal dictionary defines it as "a bar that prevents one from asserting a claim or right that contradicts what one has said or done before" (Cornell LII, estoppel). Estoppel stops a tenant that certified a rent of $9,000 a month from telling the buyer, after closing, that the rent was $8,000.
In Canada, the certificate rests on promissory estoppel, the doctrine that holds a party to an assurance another party acted on. The law firm Fogler, Rubinoff sets out the principles Canadian courts apply. They come from the Supreme Court of Canada's decision in Maracle, [1991] 2 SCR 50 (Fogler, Rubinoff, estoppel case law):
- the signer made assurances "intended to affect the legal relationship" between it and the recipient
- the recipient relied on the certificate
- relying on it, the recipient "acted on it or in some way changed its position"
Where one of the three is missing, the firm writes, the certificate loses force as a binding instrument.
An estoppel certificate looks back: it confirms the lease as it stands on the day the tenant signs. An SNDA, a subordination, nondisturbance and attornment agreement, looks ahead: it sets what happens to the lease if the landlord's lender forecloses. A lender can ask for both. Fannie Mae's guide for multifamily loans names a form for each, Form 6413 for the estoppel and Form 6415 for the SNDA. Our leasing guide sets out the three promises of an SNDA.
An estoppel certificate shows the state of one lease on one date. It confirms whether the lease is in force, the rent paid and due, the term and options, and any landlord default.
The law firm Blakes lists what certificates "typically address": "whether the lease is in good standing, the rent payable, the lease term and renewal rights, any unresolved landlord defaults, and outstanding improvement allowances" (Blakes, tenant estoppel certificates). Buyers and lenders often add questions of their own:
- the security deposit the landlord holds
- every amendment and side letter
- rent paid in advance
- any claim or set-off the tenant has against the landlord
- options to renew, expand, end the lease early or buy the building
The federal government confirms far less when it is the tenant. The General Services Administration (GSA) leases space for US federal agencies under standard clauses. Within 30 days of a joint written request from the landlord and a prospective lender or purchaser, its contracting officer sends a letter. The letter confirms three facts (GSAM 552.270-24):
- whether "the lease is in full force and effect"
- the date to which the government has paid rent and other charges in advance, if any
- whether the government has issued any notice of default
| Item | Typical certificate | GSA statement of lease |
|---|---|---|
| Lease in force | Confirmed | Confirmed |
| Rent payable | Confirmed | Left out |
| Rent paid ahead | Often asked | Confirmed |
| Term and renewal rights | Confirmed | Left out |
| Landlord defaults | Unresolved defaults listed | Any notice of default issued |
| Improvement allowances owed | Confirmed | Left out |
| Condition of the building | Varies with the form | Excluded by the clause |
The clause then narrows the letter. It rests "solely upon a reasonably diligent review" of the lease file. The government takes no liability for "any defect in or condition of the premises or building". The clause treats buyers and lenders as knowing whatever a "reasonable prepurchase and precommitment inspection" would reveal. A buyer of a building leased to GSA therefore reads the lease and inspects the space itself.
Buyers and lenders make estoppel certificates a condition of closing, so the landlord asks its tenants to sign when it sells or refinances the building. Blakes notes that "Many agreements require “clean” estoppels as a condition to closing". In a building with many tenants, that requirement "is sometimes limited in practice to major tenants or those occupying a significant portion of the property". The certificates also go stale: buyers and lenders typically want them dated "within a short window, often 30 days prior to closing".
Fannie Mae writes its rule down. A lender making a multifamily loan "must obtain a Tenant Estoppel Certificate (Form 6413) for each Material Commercial Lease" (Fannie Mae, commercial leases). A commercial lease is material when it brings in 5% or more of the property's annual effective gross income (EGI). EGI is the income the property collects after vacancy and unpaid rent. A lease for solar panels or other power generation is material at any size. For every other commercial lease, the lender "must make reasonable efforts to get a Form 6413".
Take a mixed-use apartment building with $2,000,000 of annual EGI. It has four commercial leases: a pharmacy, a café, a dry cleaner and a rooftop solar array.
Source: Sphera Credit calculation on the page's example building, $2 million of annual EGI; Fannie Mae, Multifamily Selling and Servicing Guide, Section 111 (effective September 28, 2026): Form 6413 for each Material Commercial Lease, 5% of annual EGI or power generation.
The café brings in more than five times the income of the solar lease, yet only the solar lease needs a signed certificate.
The tenant signs, through someone with authority to bind it. The landlord sends the draft, and the buyer or lender usually picks the form. The House tells its offices that "a designated representative of the Member may sign unless the document or the landlord specifies otherwise." Under the GSA clause, the contracting officer signs the government's letter.
A tenant's duty to sign comes from its lease. Blakes notes that "many leases require tenants to provide estoppels", and that "the lease-mandated form is often less detailed than what purchasers or lenders require". The GSA clause shows the usual shape of that duty: a request, a deadline of 30 days and a fixed list of facts. Questions beyond the lease's own form are for the tenant and the landlord to agree on. The House tells its offices to return the certificate "on or before the date requested."
A tenant should sign an estoppel certificate once every statement in it matches its lease, its amendments and its payment records. A court can hold the tenant to what it certified, and the tenant can lose a right the certificate leaves out.
The common mistake is to treat the request as routine paperwork and sign the landlord's draft. The House's checklist shows the opposite habit. Its offices confirm that the security deposit is $0 and check the latest rent payment with the House's finance office. Then they send the draft to the House's lawyers. Where the draft says that "the lease constitutes the entire agreement," the office adds its own lease attachment to that sentence.
Take an office tenant whose landlord sends this draft. The tenant's file disagrees with it on five lines:
| The landlord's draft says | The tenant's file shows | The tenant writes |
|---|---|---|
| Monthly base rent of $9,500 | An amendment cut the rent to $9,000 | $9,000, under the amendment |
| The lease has no amendments | One amendment, signed and dated | The amendment, by its date |
| The landlord is in no default | $40,000 of the improvement allowance is still unpaid | The $40,000 the landlord owes |
| Security deposit of $19,000 | A deposit of $18,000 | $18,000 |
| No renewal options | One five-year renewal option | The renewal option |
Signed as drafted, the certificate could let the buyer claim $500 a month more in rent and keep $1,000 more of the deposit. It could also cost the tenant the unpaid part of its tenant improvement allowance and its renewal right. A buyer's purchase and sale agreement usually lists these certificates among the closing documents, so the landlord has every reason to collect them quickly.
Canadian courts have held tenants to what they signed. In Willow Tree (Nova Scotia), a tenant that kept its complaints about the premises out of the certificate "reaffirmed the lease" and could not raise them later. In 1960529 Ontario (Ontario Superior Court, 2017), a tenant certified that there was no default under the lease. The certificate said nothing of the tenant's right of first refusal, and the court found the tenant had waived that right. In Subway (Ontario Court of Appeal, 2021), Subway had certified that its lease expired on August 23, 2018. Its own records held another date, so it sent its renewal notice late. Fogler, Rubinoff sums up the ruling: the landlord, BMO, "should not have to account for Subway's own misunderstanding" (Fogler, Rubinoff).
Yes. A signed certificate binds the tenant to its statements toward a buyer or lender that relied on them. Its reach has two limits:
- It confirms the lease and leaves it unchanged. The British Columbia Supreme Court held in 2008 that "A misstatement of legal effect of the Lease set out in the Estoppel Certificate cannot change the terms of the lease" (Fogler, Rubinoff).
- Reliance has to be reasonable. Blakes notes that "reliance on their contents is not absolute". Courts ask whether the buyer could have checked the information by reading the lease.
A buyer still reads every lease, and a tenant still reads every line of the certificate.