An SNDA agreement — Subordination, Non-Disturbance, and Attornment — is a three-party contract signed by a commercial tenant, the landlord, and the landlord’s lender that decides what happens to the lease if the landlord loses the property to foreclosure. In plain terms, the tenant agrees that the mortgage outranks the lease and that the tenant will accept whoever ends up owning the building as the new landlord. In exchange, the lender promises not to kick the tenant out as long as the tenant is paying rent and following the lease. For any business that has spent real money on a buildout or depends on a specific location, this document is one of the most important pieces of the deal.
What Each Part of an SNDA Does
The agreement is really three separate promises bundled together, each pulling in a different direction. Understanding what each one gives up and gets back is the whole point.
Subordination
The tenant agrees that the lease is junior to the lender’s mortgage, even if the lease was technically recorded first. Lenders insist on this because a senior lease could survive foreclosure and bind a new owner to terms the lender never approved, which hurts the property’s value as collateral. Commercial loans generally don’t close without it.
On its own, subordination is a losing trade for the tenant. You’re handing over the one protection recording priority would have given you. That’s why it almost never appears without the next piece.
Non-Disturbance
This is the tenant’s half of the bargain. The lender promises that if the landlord defaults and the property goes to foreclosure, the lender (or whoever buys at the foreclosure sale) will not terminate the lease, as long as the tenant isn’t in default. The tenant keeps the space, the rent, and every other term it negotiated.
For a restaurant with six figures in kitchen equipment, or a retailer whose business depends on foot traffic at one specific corner, non-disturbance is the entire reason to sign. It’s a contractual guarantee that a change of ownership upstream won’t force you out.
Attornment
Attornment runs the other way. The tenant agrees to recognize whoever takes over after foreclosure as the new landlord and to keep paying rent and performing under the lease. Without it, a tenant could try to argue that the landlord-tenant relationship ended with the old owner and walk away, or at least drag out the question in litigation. Attornment closes that door and keeps the lease in force under new ownership.
What Happens if You Don’t Have One
If your lease is junior to the mortgage and there’s no SNDA in place, a foreclosure wipes out your lease entirely. You lose the right to possession. The new owner has no obligation to honor your lease, offer you a new one, or give you a workable timeline to move out. Any money you put into tenant improvements, fixtures, or buildout costs is effectively gone. A below-market rent locked in for years disappears with it.
No federal statute saves you here. The Protecting Tenants at Foreclosure Act covers only residential property in one-to-four-family dwellings; it doesn’t reach commercial leases. The protection has to come from the SNDA itself.
Landlords who are current on their payments today can still default years into your lease. A downturn, a drop in building occupancy, or financial trouble unrelated to your space can trigger it. By that point, you have no leverage to ask for an SNDA, because the lender already has its collateral and no reason to volunteer anything.
When To Ask for One
Negotiate the SNDA before you sign the lease. At that stage the landlord wants the deal done and will push the lender to cooperate, and the lender wants the building leased up to support the loan. After the lease is signed and the loan has closed, that leverage is gone.
The cleanest approach is to write a provision into the lease itself requiring the landlord to deliver an SNDA from the current lender within a set number of days after signing, and from any future lender that refinances the property. The obligation then travels with the property rather than depending on one lender relationship. Some tenants go further and make SNDA delivery a condition to the lease taking effect.
Requests sometimes come the other direction. Lenders routinely require landlords to deliver signed SNDAs from major tenants as a condition to closing a loan. If one lands on your desk unexpectedly, the landlord is probably refinancing, and that’s a moment when you actually have room to negotiate because the lender needs your signature.
What to Watch For in the Lender’s Draft
Lenders write most SNDAs, and the first version will heavily favor the lender. Signing without reading carefully can quietly strip away protections you spent weeks negotiating into the lease.
Restrictions on Lease Amendments
Many lender forms say no lease amendment is enforceable against the lender without the lender’s prior written consent. That sounds reasonable until you realize it can block you from exercising renewal options, expansion rights, or early termination provisions you already negotiated. Each time you try to use a right you already have, you’d need the lender’s approval.
Negotiate language stating that lender consent isn’t required for any amendment that simply documents the exercise of a right already contained in the lease. The lender signed off on those rights when it underwrote the loan.
Lender Liability Carve-Outs
Lenders routinely disclaim responsibility for the prior landlord’s obligations. Common disclaimers cover security deposits, prepaid rent, tenant improvement reimbursements, and rent offsets or credits you negotiated with the old landlord. If your landlord owes you a $200,000 improvement allowance and foreclosure happens before it’s paid, a standard SNDA would let the new owner off the hook entirely.
Security deposits are especially contested. If the old landlord spent your deposit instead of holding it in escrow, the new owner will say they never received it and shouldn’t have to return it. Getting the new owner to assume deposit obligations outright is an uphill fight, but at a minimum you can push for language requiring the old landlord to transfer the deposit at the time of foreclosure.
Notice and Cure Periods for the Lender
SNDAs typically require you to send the lender a copy of any default notice you send to the landlord, and give the lender its own cure period on top of whatever the lease gives the landlord. Some drafts say the lender’s cure period doesn’t start running until the lender actually gains control of the property through foreclosure, which can take months. A tenant with a broken HVAC system and a 30-day cure clause in the lease could end up waiting much longer than that.
Push back on open-ended cure periods. A reasonable compromise is a fixed additional period, often 30 days beyond the landlord’s, with a longer extension only for defaults that genuinely can’t be fixed until foreclosure finishes.
Quiet Changes to Lease Terms
Some lender drafts eliminate renewal options, rights of first refusal, or termination rights, or add provisions saying the new owner won’t be bound by certain lease obligations at all. Read the SNDA against the lease line by line. If anything in the SNDA contradicts the lease, flag it. The agreement is supposed to preserve your lease, not rewrite it.
How an SNDA Is Different From an Estoppel Certificate
Tenants sometimes mix these up because both show up during financing. They do different jobs. An estoppel certificate is a snapshot: a written confirmation of the current rent, the expiration date, whether any defaults exist, and similar facts. It gives a lender or buyer reliable verification of the lease terms.
An SNDA creates new rights and obligations. It establishes what happens if the property changes hands through foreclosure, locks in the tenant’s occupancy, and sets the rules between tenant and lender going forward. An estoppel describes the deal today. An SNDA governs what happens if the deal breaks.
Signing and Recording
All three parties — tenant, landlord, and lender — should sign through authorized representatives. Having the landlord sign as a full party rather than merely acknowledging the document matters, because it binds the landlord to the agreement’s terms, including any restrictions on lease amendments. A landlord that only “acknowledges” the SNDA may not have enforceable obligations under it.
Most parties record the SNDA in the county land records where the property sits. Recording creates public notice, which protects the tenant if the property is later sold or refinanced by a new lender that might otherwise claim no knowledge of the tenant’s rights. An unrecorded SNDA is still a valid contract between the signing parties, but recording extends the protection against future third parties who weren’t at the original closing.
Given how one-sided most lender-drafted forms are, a real estate attorney’s review before signing is worth the cost. An experienced lawyer can catch provisions that silently override lease protections and negotiate language that preserves the rights you bargained for in the first place.