When you sign a commercial lease, your landlord’s mortgage lender may ask you to sign a separate document called an SNDA. It often arrives with little explanation, buried in loan paperwork, and many tenants sign without understanding what it does.
An SNDA stands for Subordination, Non-Disturbance, and Attornment agreement. It governs the relationship between you, your landlord, and your landlord’s lender if the property is ever foreclosed. This guide explains each part in plain language, why lenders insist on it, and what to negotiate before you sign.
What Is an SNDA?
An SNDA is a three-party agreement between a commercial tenant, the landlord, and the landlord’s mortgage lender. It settles in advance what happens to your lease if the lender forecloses on the property because the landlord defaulted on the loan.
Without an SNDA, the outcome of a foreclosure for a tenant is uncertain. In many states, a foreclosure wipes out leases that were signed after the mortgage was recorded. That means a new owner who buys the property at a foreclosure sale could potentially terminate your lease and evict your business. An SNDA replaces that uncertainty with a negotiated set of rules.
Lenders request SNDAs because a property with stable, paying tenants is worth more as collateral. Your lease is part of what makes the building valuable. The lender wants assurance that its rights come first, while you want assurance that you will not lose your space through no fault of your own. The SNDA is the document where those competing interests get balanced.
The Three Parts of an SNDA
The name describes three distinct promises. Each one addresses a different scenario, and together they cover the full range of outcomes after a foreclosure.
Subordination
Subordination means your lease is legally junior to the lender’s mortgage. If there is a conflict between the mortgage and your lease, the mortgage wins. In practical terms, this confirms that a foreclosure can extinguish your leasehold interest unless the non-disturbance portion of the agreement says otherwise.
Most commercial leases already contain a subordination clause, often stating that the lease is automatically subordinate to any current or future mortgage on the property. If your lease has one, the SNDA simply restates and confirms that position for the specific lender involved. Review your commercial lease agreement clauses carefully to see whether subordination is already built in.
Non-Disturbance
Non-disturbance is the tenant’s side of the bargain. The lender promises that, as long as you are not in default under your lease, it will not disturb your possession if it forecloses and takes over the property. You get to stay in your space for the remainder of your lease term, paying rent to the new owner instead of your old landlord.
This is the most valuable part of the agreement for tenants. It converts a risky situation into a stable one. Instead of facing eviction after a foreclosure sale, you continue operating your business under the same lease terms. For that reason, experienced tenant representatives treat the non-disturbance promise as non-negotiable.
Attornment
Attornment means you agree to recognize the lender, or whoever buys the property at foreclosure, as your new landlord. You promise to keep paying rent and performing your lease obligations to the successor owner. It is the mirror image of non-disturbance: the lender leaves you alone, and you accept the lender as your landlord.
Attornment usually happens automatically upon foreclosure, without any further paperwork. Your rent checks simply go to a new payee. The lease terms themselves do not change, which is why the non-disturbance language matters so much. Together, these two provisions preserve the status quo for the tenant.
Why Lenders Insist on an SNDA
From the lender’s perspective, an SNDA protects the value of its collateral. A foreclosed building with no tenants, or with tenants whose leases might be terminated, is harder to sell and generates no income. By locking in the lease structure, the lender knows exactly what income stream it is acquiring if it has to take the property back.
Lenders also use SNDAs to clean up ambiguities. Commercial leases contain all kinds of custom provisions, and a lender reviewing the loan does not want surprises. The SNDA gives the lender a signed statement from the tenant confirming the lease terms.
This is closely related to the estoppel certificate, another document lenders routinely request from tenants. While an estoppel certificate confirms the current facts of the lease, an SNDA sets the rules for the future. Lenders frequently ask for both at the same time.
When You Will Be Asked to Sign One
The most common trigger is a new loan or a refinancing on the building you occupy. Your landlord’s lender will send SNDA forms to every tenant as part of the loan closing process. You may also encounter SNDA requests when the property is being sold to a new owner who is financing the purchase.
The request sometimes arrives days before a loan closing, with pressure to sign immediately. Landlords may be contractually obligated to deliver signed SNDAs as a loan condition. Understanding the document in advance lets you respond quickly without giving up protections.
If you are negotiating a new lease, it is smart to address the SNDA before you sign. Ask the landlord which lender holds the mortgage and whether an SNDA will be required. Getting the lender’s form early gives you and your attorney time to review it properly. This is one of several practical tips for negotiating a commercial lease that can save you trouble later.
Key Terms to Negotiate in an SNDA
Lenders typically present their own standard form, drafted to favor the lender. You are not obligated to accept it as written. Focus your negotiation on the following points.
Limit the Non-Disturbance Conditions
Some lender forms condition non-disturbance on requirements that go beyond simply not being in default. For example, the form might say the lender is not bound by lease amendments made without its consent, or not bound to return your security deposit. Push back on language that weakens your position. The non-disturbance promise should apply whenever you are in compliance with your lease, full stop.
Protect Your Prepaid Rent and Security Deposit
Many SNDA forms state that the successor owner is not liable for prepaid rent or security deposits it never received from the old landlord. That can leave you paying twice. Negotiate language requiring the new owner to honor these amounts, or at least requiring the old landlord to transfer them. This is especially important if you paid a large deposit or several months of rent in advance.
Carve Out Landlord Defaults
Standard forms often say the new owner is not liable for defaults the old landlord committed before the foreclosure. If your landlord owed you a tenant improvement allowance or promised repairs it never completed, you could lose those rights. Try to preserve claims for pre-existing landlord defaults, or at least for obligations that continue into your tenancy.
Address Casualty and Condemnation
Check how the SNDA treats your lease rights if the building is damaged or condemned. Some forms give the successor owner broader termination rights than your original lease allowed. Make sure the SNDA does not quietly expand the circumstances under which your tenancy can be ended.
What Happens If You Refuse to Sign
Whether you can refuse depends on your lease. Many commercial leases include a clause requiring the tenant to execute SNDAs and estoppel certificates upon request, sometimes within ten or fifteen days. If your lease has that clause, refusing could put you in default.
If your lease does not require it, you have more leverage, but refusing still has consequences. The landlord’s loan may fall through, which could lead to financial distress for the building. In practice, most tenants sign, but they negotiate the form first. An outright refusal is rare and usually a last resort when the lender will not agree to reasonable non-disturbance terms.
Note that some leases make the SNDA obligation mutual in a useful way: the landlord must use reasonable efforts to obtain a non-disturbance agreement from the lender. If your lease lacks that protection, consider adding it at renewal time. Review your lease renewal options with this in mind.
Does every commercial tenant need an SNDA?
Not every tenant will be asked for one, but any tenant in a mortgaged building should understand the concept. Small tenants in large buildings are sometimes skipped, while anchor tenants are almost always required to sign. If your business depends on its location, the protection is worth pursuing even if the lender does not ask.
Can a lender terminate my lease after foreclosure if I signed an SNDA?
Generally no, as long as you are not in default. That is the entire point of the non-disturbance provision. The lender steps into the landlord’s shoes and your lease continues. The main exceptions are defaults on your part or specific carve-outs you agreed to in the SNDA itself.