---
title: "ILAT (Indice des Loyers des Activités Tertiaires) — Class A Atlas glossary"
description: "French rent index for tertiary leases."
canonical: https://classa.info/glossary/ilat
pageType: glossary
lastUpdated: 2026-04-01T00:00:00.000Z
license: "CC BY 4.0 with attribution to Class A Atlas (https://classa.info)."
---

> French rent index for tertiary leases.

## TL;DR

- French rent index for tertiary leases.
- Office leases in France typically index annually to the ILAT.

# ILAT (Indice des Loyers des Activités Tertiaires)

*Lease economics · EU*

## Short definition

French rent index for tertiary leases.

## Full definition

Office leases in France typically index annually to the ILAT. Caps are negotiable. Replaced ICC (Indice du Coût de la Construction) for tertiary leases in 2014.

## Why this matters for Class A leasing

ILAT (Indice des Loyers des Activités Tertiaires) is part of the lease economics vocabulary that institutional [Class A](/glossary/class-a) occupiers, landlords, and advisers use across EU markets. Understanding it correctly affects how you read lease documents, model occupancy economics, and benchmark deal terms across cities. Class A Atlas tracks the EU definition alongside the global standard so [cross-border](/topics/cross-border-expansion) occupiers can translate quickly.

## See also

- [Indexation](/glossary/indexation)
- [Rent review](/glossary/rent-review)

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