Estoppel Certificate vs SNDA: What's the Difference?

An estoppel certificate and an SNDA are two different documents a lender or buyer collects from tenants, and they do different jobs. An estoppel certificate is the tenant's signed confirmation of the current facts of its lease: the rent, the dates, that the lease is in effect, and that no one is in default. An SNDA (subordination, non-disturbance, and attornment agreement) governs what happens to the lease if the landlord's loan is foreclosed. The estoppel certifies today's facts; the SNDA controls a future event. A lender usually wants both.

If you are abstracting leases for a financing or acquisition, you will see both documents on the closing checklist, and people often confuse them because tenants sign both at the same time. They are not interchangeable. Below is what each one does, where they overlap, and why a lender almost always asks for the pair.

What is an estoppel certificate?

An estoppel certificate is a short statement, signed by the tenant, that confirms the key facts of its lease so a third party can rely on them. It typically states the commencement and expiration dates, the current base rent and any prepaid rent, the security deposit on file, that the lease is in full force and effect, that there are no unwritten amendments, and that neither party is in default. A lender uses it to verify the rent roll before closing a loan, and a buyer uses it to confirm the income it is paying for is real. The word estoppel matters: once the tenant signs, it is later estopped, meaning legally barred, from claiming the facts were different. For the full breakdown, see our guide to what an estoppel certificate is and what it includes.

What is an SNDA?

An SNDA is a three-party agreement among the tenant, the landlord, and the landlord's lender that sorts out priority and protection if the loan goes into foreclosure. It has three parts. Subordination places the lease behind the mortgage in priority, which the lender requires so its lien sits first. Non-disturbance is the tenant's protection in return: as long as the tenant pays rent and is not in default, a foreclosing lender will not terminate the lease or evict the tenant. Attornment means the tenant agrees to recognize the new owner after foreclosure as its landlord and keep paying rent. The net effect is that the lender gets priority while a good tenant keeps its space. Our deeper explainer covers each part in the SNDA agreement explained.

What is the difference between an estoppel certificate and an SNDA?

The core difference is time and purpose. An estoppel certificate confirms the present state of the lease so a lender or buyer can trust today's numbers. An SNDA sets the rules for a future event, foreclosure, and protects the tenant's occupancy if it happens. An estoppel is a one-way certification signed by the tenant; an SNDA is a negotiated three-party contract with ongoing obligations. An estoppel changes nothing about the lease; an SNDA can change the tenant's priority and rights. They answer different questions: the estoppel asks what is true now, the SNDA asks what happens if the loan defaults.

Do you need both an estoppel and an SNDA?

For a financed deal, lenders usually want both because each closes a different gap. The estoppel verifies that the income and lease terms are what the loan was underwritten on, with no side deals or undisclosed defaults. The SNDA protects the value of that income after a foreclosure by keeping creditworthy tenants in place rather than letting leases wipe out. A cash buyer with no loan may collect only estoppels, since there is no lender to subordinate to. When financing is involved, expect to chase both from the major tenants, which is why both sit on the same closing checklist and tenants often sign them together.

Who signs an estoppel certificate and an SNDA?

The tenant signs both, but the parties differ. An estoppel certificate is signed by the tenant alone, certifying facts to the landlord and, through the landlord, to the lender or buyer. An SNDA is signed by three parties: the tenant, the landlord, and the lender, because all three are bound by it. The landlord or property manager usually prepares and circulates both, often using a form attached as an exhibit to the lease so the language is pre-agreed and the tenant cannot stall the deal by negotiating from scratch.

Does the lease require estoppels and SNDAs?

Most commercial leases include a clause requiring the tenant to deliver an estoppel certificate within a set window, often 10 to 20 days, when the landlord requests one for a sale or financing. Many leases also obligate the tenant to sign an SNDA in a reasonable form when the landlord places a loan on the property. When abstracting a lease, these obligations are exactly the kind of provision worth flagging, because a lender's diligence checklist depends on them. A missing or weak estoppel or SNDA clause can slow a closing while counsel negotiates the terms after the fact.

How abstraction helps with estoppels and SNDAs

Before a tenant can sign a clean estoppel, someone has to know what the lease actually says, the exact rent, the real commencement date, the amendments in effect, and whether any default or offset exists. That is a lease abstraction job. A complete abstract gives the landlord the facts to fill the estoppel correctly and gives the lender the data to check it against the rent roll. Automated lease abstraction pulls those fields in minutes and links each one back to its source page, so the team filling out an estoppel or reviewing an SNDA obligation is working from verified data rather than re-reading the lease. For lender-side work specifically, see lease abstraction for lenders, and for the legal review angle, lease abstraction for paralegals. The underlying tool is our lease abstraction software.

Estoppel vs SNDA at a glance

An estoppel certificate is a tenant's snapshot of the current lease facts that a lender or buyer relies on; an SNDA is a three-party agreement that subordinates the lease to the loan, protects a paying tenant from eviction after foreclosure, and binds the tenant to the new owner. The estoppel verifies the present, the SNDA governs the future, and a financed deal generally needs both. Get the underlying lease data right first, then the documents are straightforward to produce and review.

Once the documents are agreed, teams typically send the estoppel and SNDA out for e-signature so all parties can execute quickly inside the closing window. Lenders running the underlying credit and collateral review often pair the lease data with AI loan underwriting software to assess the deal, and where tenants must carry specific coverage, landlords track those policies with certificate of insurance tracking software on the same closing checklist.