SNDA Explained: Why This One Agreement Can Make or Break Your Net Lease Deal

What it is

An SNDA is three promises stapled into one document, signed by the tenant, the landlord, and the lender.

Subordination means the tenant agrees its lease sits behind the mortgage — if the property gets foreclosed on, the loan wins first. Non-disturbance means the lender, in exchange, promises not to kick the tenant out if that foreclosure happens, as long as the tenant keeps paying rent. Attornment means the tenant agrees that if a new owner takes over (say, the bank after foreclosure), the tenant will treat that new owner as the landlord and keep paying rent under the same lease.

Put simply: it's the paperwork that decides who gets protected if things go sideways with the mortgage.

How it plays out in retail net lease

Here's how I look at it. In a net lease deal, you're buying a stream of rent from a tenant you're betting on — Walgreens, a QSR, a dollar store, whoever. The SNDA is what keeps that rent stream intact no matter what happens to the ownership or the debt sitting on top of it.

Without an SNDA, a tenant's lease can technically get wiped out in a foreclosure, because it's subordinate to the mortgage by default in most financing docs. That's obviously not what any landlord or lender actually wants — a vacant box is worth less than a leased one to everybody involved. So the lender agrees not to disturb the tenant, and the tenant agrees to keep paying rent to whoever ends up owning the building.

On the buy side, this matters at closing. If you're financing the acquisition, your lender is going to require an SNDA from the tenant as a condition of the loan. No SNDA, no funding — I've seen closings slip two or three weeks because nobody asked for it early enough. On the tenant side, especially with national credit tenants, their legal department has a standard SNDA form they'll push back with, and negotiating that redline can take longer than negotiating the lease itself.

What to watch for

• Confirm the lease itself even requires the tenant to sign an SNDA on request — some older or poorly drafted leases don't obligate the tenant to cooperate, which leaves you stuck.
• Check whether the tenant's SNDA form caps the lender's exposure or adds conditions (notice-and-cure periods, casualty carve-outs) that weaken the non-disturbance protection.
• Watch the timeline — national tenants often route SNDA requests through in-house counsel, and that can take weeks, not days.
• Make sure the attornment language is mutual — the new owner should also be bound to honor the lease terms, not just the tenant bound to keep paying.
• If there's an existing loan being assumed, verify an SNDA is actually on file; I've seen deals where everyone assumed one existed and nobody could produce it.

How to use it to your advantage

Ask for the SNDA — or at least the tenant's SNDA request form — during due diligence, not after you're under contract to close in ten days. It tells you a lot about how easy or hard this tenant is to work with post-closing.

If you're the one arranging financing, get your lender's SNDA requirement in writing early and hand it to the tenant's counsel on day one. The earlier that negotiation starts, the less likely it holds up your closing date.

And if you're evaluating two similar deals, a tenant with a clean, cooperative SNDA history is a real point in that deal's favor — it's a small signal about how the tenant behaves as a long-term counterparty, not just as a name on a rent roll.

Best case, worst case

Best case:

• SNDA is negotiated and signed well before closing, with no unusual carve-outs
• Lender, landlord, and tenant are all protected exactly as intended
• Financing closes on schedule with no last-minute conditions

Worst case:

• Tenant's legal team slow-walks the SNDA and the closing timeline slips
• The lease doesn't obligate the tenant to sign one at all, leaving your lender exposed
• A foreclosure happens without a valid SNDA in place, and the tenant's lease — and your rent stream — is at risk

This article is for general education, not investment, tax, or legal advice — verify all deal-specific details independently with qualified counsel.