The Playbook / Clause 7

SNDA & Estoppel Certificates

Subordination; Non-Disturbance; Attornment; Estoppel Certificates

A Subordination, Non-Disturbance, and Attornment Agreement (SNDA) governs the relationship between the tenant and the landlord’s mortgage lender. Subordination places the lease behind the lender’s mortgage; Non-Disturbance protects the tenant’s possession and lease rights if the lender forecloses; Attornment requires the tenant to recognize the foreclosing lender (or its assignee) as the new landlord.

The Estoppel Certificate is the tenant’s confirmation of the lease status (rent, term, defaults, modifications) for the benefit of lenders, purchasers, or other third parties.

Together, the SNDA and the Estoppel are the documents that preserve and confirm tenant’s rights when the landlord’s interest is sold or financed.

LANDLORD TENANT LENDER The lease The loan + trust deed Non-disturbance: your lease survives foreclosure Subordination: the lease ranks behind the loan Attornment: you accept the foreclosure buyer as landlord
The SNDA in one play: the tenant gives up priority (subordination, attornment) and gets survival back (non-disturbance). The non-disturbance promise is the one worth fighting for.

What the landlord’s form is doing

Landlord wants tenant’s automatic subordination to current and future mortgages, and tenant’s prompt delivery of estoppel certificates without conditions. Landlord prefers a clean (one-way) subordination, no required non-disturbance covenant from the lender, broad attornment language, and unilateral estoppels with deemed-acceptance if tenant fails to respond.

For subordination, landlord prefers "automatic and self-executing" language so that no separate SNDA document is required. This eliminates the need to deliver an SNDA on each financing event.

For estoppels, landlord prefers a short response window (e.g., five (5) business days), a deemed-acceptance mechanic, broad delivery to "any party," and landlord-prepared form.

Landlord-form subordination clauses go beyond self-executing language: they appoint Landlord (and the lender) as Tenant’s attorney-in-fact to execute subordination and attornment instruments if Tenant does not sign on demand, and they include Tenant’s waiver of any statutory right to terminate the Lease upon foreclosure.

Landlord counsel treats standard notice-and-cure default mechanics as inadequate against estoppel delay when a sale or financing is on a deadline, and now drafts estoppel clauses that eliminate the default notice and cure period entirely for failure to return a signed certificate by the stated deadline, making the failure an immediate default; the fallback is a two-request structure under which remedies arise only after a second request and a short additional period.

What tenants should watch for

SNDA: refuse subordination without non-disturbance. Tenant should refuse to subordinate without an executed SNDA from the lender containing a meaningful non-disturbance covenant. Subordination without non-disturbance gives the lender the right to terminate the lease on foreclosure, the worst of both worlds for tenant.

Required elements of a tenant-favored SNDA

Estoppels: limit to factual matters. Tenant should limit estoppel content to factual matters tenant can confirm: rent amounts, term, lease modifications, no known defaults, no setoffs or defenses. Reserve the right to qualify with "to Tenant’s knowledge" or "to Tenant’s knowledge after reasonable inquiry."

Other estoppel terms

Strike attorney-in-fact appointments. Refuse any provision appointing Landlord or the lender as Tenant’s attorney-in-fact to execute subordination, attornment, or estoppel instruments on Tenant’s behalf; the appointment converts Tenant’s leverage on each future financing into a unilateral landlord right.

Estoppel scope traps. Landlord estoppel forms demand representations well beyond lease status: that no material adverse change in Tenant’s financial condition has occurred since lease execution; that no bankruptcy action is pending; that Tenant’s claims against Landlord are subordinate to the lender or purchaser and may be enforced only by money judgment, not as an offset or defense; and a catchall covering “any other information reasonably requested.” Strike the financial-condition, claims-subordination, and catchall items and confine the certificate to lease-status facts.

Reciprocity in practice. Where the lease addresses a landlord estoppel at all, landlord forms condition delivery on Tenant never having been in default, payment of a processing fee, a thirty (30) day response period, content satisfactory to Landlord in its sole discretion, and an annual cap on the number of certificates; negotiate a genuinely reciprocal obligation instead.

Outside date on lender cure rights. Landlord forms bar Tenant from terminating or claiming constructive eviction until Tenant has given notice to the lender and a thirty (30) day cure period has run, with the period extended indefinitely while the lender “with reasonable diligence” pursues a cure; cap the extension with a fixed outside date so an open-ended lender cure right does not suspend Tenant’s remedies indefinitely.

Estoppel-delay mechanics and truthful qualifications. Refuse any provision making failure to return an estoppel certificate an immediate default without notice or cure; if Landlord insists on acceleration, accept at most the published two-request compromise, under which remedies arise only after a second written request bearing conspicuous warning language and a further reasonable period, and confirm that the aggregate response time does not fall below the ten (10) to fifteen (15) business days negotiated above. Treat every estoppel request as a claims-preservation checkpoint: a truthful marked-up certificate that lists actual landlord defaults, offsets, and unresolved disputes is a legitimate vehicle for preserving claims that an unqualified certificate would waive; the landlord trade press acknowledges that the tactic succeeds where the listed items are true, while a false list exposes Tenant to liability.

Pre-agreed representation lists. Landlord forms now front-load the estoppel negotiation into the lease itself with a clause listing specific representations (lease confirmation and page counts, premises description, term and rent-commencement dates, options held, rent and security deposit status, defaults, and similar items) that Tenant pre-agrees to certify, in whole or in part, within ten (10) days of request, eliminating Tenant’s transactional leverage once a sale or financing is pending. If such a clause is unavoidable, negotiate the list at signing: confine every item to factual matters, add knowledge qualifiers, delete any catchall for other information reasonably requested, and attach the agreed certificate form as a lease exhibit so that no new representations may be added at the request stage.

How this typically gets negotiated

Tenants negotiate to make subordination conditional: the lease subordinates only if the lender signs a non-disturbance agreement protecting the tenant's possession after foreclosure. The details that matter are the successor landlord's obligations: how much prepaid rent and deposit it must honor, and which landlord defaults it inherits. Estoppel negotiations focus on response windows and limiting the certificate to factual confirmations.

The specific language that resolves each of these points depends on the deal. Talk to Paul about your lease →

How the states treat it

Majority rule. Most jurisdictions enforce subordination provisions contractually; non-disturbance protections are tenant’s primary leverage and the focus of SNDA negotiation. Estoppels are enforced as contractual representations that estop tenant from later asserting positions inconsistent with the estoppel.

Estoppel enforceability. Courts strictly enforce estoppels signed by sophisticated commercial tenants. A tenant who signs an estoppel confirming "no defaults known to Tenant" cannot later assert a default of which the tenant had knowledge at the time of signing. Tenant counsel should qualify estoppels with care.

Notable cases

Off. Depot, Inc. v. Dist. at Howell Mill, LLC, 309 Ga. App. 525, 710 S.E.2d 685, 11 FCDR 1423, 2011 WL 1715775 (2011). A tenant that certified in an estoppel certificate delivered to an incoming co-owner that the landlord was not in default was precluded from later asserting a known exclusive-use violation as a breach; estoppel certificates must be qualified for known and ongoing claims.

Aerotek, Inc. v. 757 3rd Ave. Assoc., 162 A.D.3d 419, 419, 74 N.Y.S.3d 740, 2018 N.Y. Slip Op. 03943, 2018 WL 2616492 (2018). Tenants whose estoppel certificates stated that no further tenant-improvement allowances were owed could not recover unpaid allowances from the building purchaser; the court enforced the unqualified certification absent fraud or duress in the making of the certificate.

Fillable forms

Free to download and use. Like any form, these are starting points — tailor them to your deal, or have Paul do it. More on the Resources page.

Game film: real clauses from real leases

Excerpts from commercial leases filed as exhibits with the Securities and Exchange Commission, trimmed for length. Follow the citation for the full document on EDGAR.

“Bank, for itself and its successors and assigns, for any purchaser at a foreclosure sale under the Mortgage, for any transferee who acquires the Property by deed in lieu of foreclosure or otherwise, and for the successors and assigns of such purchaser and transferee … covenants and agrees with Tenant that if Bank or other New Landlord shall commence any proceedings to foreclose the Mortgage for any reason whatsoever, or shall succeed to the interest of Landlord by foreclosure, deed in lieu thereof or otherwise, provided that (a) the Lease is at all times in full force and effect; (b) Tenant is in possession of the Property; and (c) Tenant is not then in default under the Lease, then: … (iii) Tenant's possession of the Property and Tenant's rights and privileges under the Lease shall not be diminished, interfered with, or disturbed by such Bank or such other New Landlord by any steps or proceedings taken by Bank in exercise of any of its rights under the Mortgage …”

Why it matters. This is the core protection a tenant should demand before subordinating to any mortgage; without an express non-disturbance covenant from the lender, a foreclosure can wipe out the lease no matter how much the tenant has invested in the space.

Subordination, Non-Disturbance and Attornment Agreement dated as of December 2023, among Univest Bank and Trust Co., Veterans Circle Group, LLC (landlord), and Arbutus Biopharma, Inc. (tenant), relating to a Lease Agreement dated August 9, 2016 (701 Veterans Circle, Warminster, Pennsylvania); Ex. 10.16 to Arbutus Biopharma Corp. Form 10-K, filed Mar. 5, 2024, SEC EDGAR.
“Tenant agrees, for the benefit of New Owner and effective immediately and automatically upon the occurrence of any such transfer, that: (a) Tenant shall pay to New Owner all rental payments required to be made by Tenant pursuant to the terms of the Lease for the remainder of the Lease term; … (c) Tenant hereby attorns to New Owner as its landlord, such attornment to be effective and self-operative without the execution of any further instrument; (d) New Owner shall not be liable for any default of any prior landlord under the Lease, including, without limitation, Owner, except where such default is continuing at the time New Owner acquires title to the leased premises and New Owner fails to cure same after receiving notice thereof; (e) New Owner shall not be subject to any offsets or defenses which Tenant may have against any prior landlord under the Lease …”

Why it matters. Lender form attornment clauses like this one cut off the tenant's claims and offsets against a foreclosing successor except for defaults that are still continuing, so a tenant should negotiate to preserve accrued offset rights, prepaid rent credit, and unfunded allowance obligations.

Form of Subordination Agreement and Estoppel, Non-Disturbance and Attornment Agreement between NetScout Systems, Inc. (tenant) and Bank of America, N.A., as Trustee (lender), attached as Exhibit A to the Third Amendment to Lease dated August 10, 2010, between Westford West I Limited Partnership and NetScout Systems, Inc. (310 Littleton Road, Westford, Massachusetts); Ex. 10.1 to NetScout Systems, Inc. Form 10-Q, filed Nov. 9, 2010, SEC EDGAR.
“At any time within seven (7) days after written notice from Landlord, Tenant shall execute, acknowledge, and deliver to Landlord a certificate in a form satisfactory to Landlord certifying: (a) that this Lease is unmodified and in full force or, if there have been modifications, that this Lease is in full force, as modified, together with the date and nature of each modification, … and (e) other matters as may be reasonably requested by Landlord. Any certificate may be relied on by prospective purchasers, mortgagees, or beneficiaries under any deed of trust on the Building or any part of it. Tenant’s failure to provide such certificate within this deadline shall be an Event of Default, without any additional cure period.”

Why it matters. A seven day deadline in a form satisfactory to the landlord, with an automatic uncured Event of Default as the penalty, is a trap for busy tenants; negotiate a longer response window, a reasonableness standard for the form, and a notice and cure period before any default arises.

Office Lease between AE-Hamm's Property Owner, LLC (landlord) and Asana, Inc. (tenant), The Hamm's Building, 1550 Bryant Street, San Francisco, California (lease prepared May 27, 2011), Section 21; Ex. 10.13 to Asana, Inc. Form S-1, filed Aug. 24, 2020, SEC EDGAR.

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