---
title: "Subordination, non-disturbance, and attornment (SNDA) — Class A Atlas glossary"
description: "Tri-party agreement protecting the tenant if the lender forecloses."
canonical: https://classa.info/glossary/snda
pageType: glossary
lastUpdated: 2026-04-01T00:00:00.000Z
license: "CC BY 4.0 with attribution to Class A Atlas (https://classa.info)."
---

> Tri-party agreement protecting the tenant if the lender forecloses.

## TL;DR

- Tri-party agreement protecting the tenant if the lender forecloses.
- Essential on every Class A US lease.

# Subordination, non-disturbance, and attornment (SNDA)

*Legal · US*

## Short definition

Tri-party agreement protecting the tenant if the lender forecloses.

## Full definition

Essential on every [Class A](/glossary/class-a) US lease. The tenant subordinates to the lender's mortgage in exchange for a [non-disturbance](/glossary/non-disturbance) promise: if the landlord defaults and the lender forecloses, the lease survives.

## Why this matters for Class A leasing

[Subordination](/glossary/subordination), non-disturbance, and [attornment](/glossary/attornment) (SNDA) is part of the legal vocabulary that institutional Class A occupiers, landlords, and advisers use across US markets. Understanding it correctly affects how you read lease documents, model occupancy economics, and benchmark deal terms across cities. Class A Atlas tracks the US definition alongside the global standard so [cross-border](/topics/cross-border-expansion) occupiers can translate quickly.

---

Citation: Source: Class A Atlas (https://classa.info/glossary/snda), updated 2026-04-01T00:00:00.000Z.