SNDA Agreement Explained: Subordination, Non-Disturbance and Attornment

An SNDA is a subordination, non-disturbance, and attornment agreement: a three-party contract among a tenant, its landlord, and the landlord's lender that decides what happens to a commercial lease if the lender forecloses. The tenant agrees its lease is subordinate to the mortgage and that it will recognize a new owner after foreclosure (attornment), and in exchange the lender agrees not to terminate the lease or disturb the tenant's possession as long as the tenant is not in default (non-disturbance). It is the document that lets a lease and a loan coexist on the same building.

SNDAs show up at almost every commercial real estate financing, and they sit right next to the leases a legal team is already reviewing. If you abstract leases for a deal, you need to know which ones carry an SNDA obligation, what they say, and how the agreement protects each side. This guide walks through the three parts, who signs, how an SNDA differs from an estoppel certificate, and why lenders insist on them.

What does SNDA stand for?

SNDA stands for subordination, non-disturbance, and attornment. Each word is a separate promise. Subordination means the tenant agrees its lease ranks below the lender's mortgage, so the loan has priority. Non-disturbance is the lender's promise not to evict a paying tenant after a foreclosure. Attornment means the tenant agrees to accept and pay rent to whoever owns the property after foreclosure, treating the new owner as its landlord. Bundled together, the three terms keep a lease alive through a change in ownership.

What is an SNDA agreement?

An SNDA agreement is a contract that aligns the rights of a tenant, a landlord, and the landlord's mortgage lender on one question: if the lender takes the property back, does the lease survive? Without it, foreclosure can wipe out a lease that was signed after the mortgage was recorded, because the lease is junior to the loan. The SNDA rewrites that outcome. The tenant subordinates and agrees to attorn to the new owner, and the lender agrees not to disturb the tenant. Each party trades a concession for protection, which is why all three sign.

What is subordination, non-disturbance, and attornment?

Subordination sets priority: the lease is junior to the mortgage, so the lender's interest comes first in a default. Non-disturbance is the tenant's payoff for subordinating: as long as the tenant pays rent and honors the lease, a foreclosing lender or a buyer at the foreclosure sale will leave the tenant in place on the existing lease terms. Attornment closes the loop by binding the tenant to the new owner, so the lender that ends up owning the building inherits a paying tenant rather than a vacancy. The three only work as a set, which is why they travel together in one agreement.

Who signs an SNDA?

Three parties sign an SNDA: the tenant, the landlord, and the landlord's lender. The lender usually drafts it because the lender is protecting its collateral, and the tenant's signature is the one that carries the negotiated concessions. In practice the landlord delivers the form to the tenant during a financing or refinancing, the tenant's counsel reviews and negotiates the non-disturbance language, and all three execute it before the loan closes. For a large tenant, the SNDA can be as heavily negotiated as the lease itself.

Why do lenders require an SNDA?

Lenders require an SNDA so a foreclosure does not hand them an empty building. The non-disturbance promise costs the lender little, because it only protects a tenant who keeps paying, and in return attornment guarantees that the income stream behind the loan keeps flowing to the new owner. Lenders care most about strong, creditworthy tenants whose rent supports the debt service, so SNDAs are usually required for anchor and major tenants and sometimes for every tenant above a size threshold. The lender's underwriting of that lease income is the same analysis covered in lease abstraction for lenders, and lenders increasingly run that loan and collateral review with AI loan underwriting software.

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

An SNDA and an estoppel certificate are both delivered at financing, but they do different jobs. An estoppel certificate is a snapshot: the tenant confirms the current facts of the lease, such as the rent, the dates, and that no default exists, so the lender or buyer can rely on them. An SNDA is forward-looking: it sets the rules for what happens to the lease after a future foreclosure. One verifies the present; the other governs the future. A lender often asks for both at once, which is why a legal team reviewing leases prepares them together. For the snapshot side, see estoppel certificate explained.

Is an SNDA required?

No law requires an SNDA, but two things commonly do. First, the loan documents: a lender usually conditions funding on receiving SNDAs from specified tenants. Second, the lease itself: many commercial leases contain a clause obligating the tenant to sign a reasonable SNDA on request, and some condition the tenant's agreement to subordinate on receiving non-disturbance in return. Whether an SNDA is effectively required for a given lease comes down to what that lease and the loan demand, which is exactly the kind of provision a lease abstract should flag.

What happens if there is no SNDA?

Without an SNDA, the outcome depends on lease priority. If the lease is subordinate to the mortgage and there is no non-disturbance protection, a foreclosure can terminate the lease and the new owner can evict even a paying tenant. If the lease is senior to the mortgage, it can survive foreclosure, but then the lender lacks attornment and may inherit lease terms it never approved. Either way, the absence of an SNDA introduces uncertainty that lenders dislike, which is why they push to get them signed before closing.

How SNDAs fit lease review and diligence

For a paralegal or attorney clearing a data room, the SNDA and subordination clauses are part of the same read as the assignment, option, and notice provisions. You need to know which leases already obligate the tenant to sign an SNDA, which condition subordination on non-disturbance, and which key tenants the lender will demand one from. Abstracting those terms per lease, source-linked to the clause, is the work described in lease abstraction for paralegals and attorneys, and the broader tool that pulls every lease provision into a structured abstract is our lease abstraction software. The subordination and estoppel fields belong on the commercial lease abstract template alongside rent, dates, and options.

Once the form is negotiated, an SNDA still has to be executed by three parties on a closing timeline, which is why many teams route it through online document signing to collect signatures from the tenant, landlord, and lender without the mail-and-scan delay. The same closing checklist usually gathers tenant insurance, and tracking those certificates against the lease requirements is easier with dedicated certificate of insurance tracking software. Handle the SNDAs, estoppels, and abstracts together, and the lease side of a financing stops being the thing that holds up the close.