Commercial Lease Rent Review: The 25% Threshold Deciphered by the French Supreme Court

Imagine: you own a commercial property in Lyon, rue de la République. Your tenant has run a clothing boutique there since 2005. The lease contains an indexation clause (automatic rent adjustment based on an index). In 2010, you notice the rent has increased by 30% compared to the initial rent. You request a rent review, but the tenant refuses, arguing that the indexation is regular. Who is right? The answer lies in a precise calculation: the quarter variation.

This question is asked by hundreds of landlords and tenants each year. Article L. 145-39 of the French Commercial Code allows a party to request a rent review when, due to the indexation clause, the rent increases or decreases by more than one quarter compared to the price previously fixed contractually. But how is this "quarter" measured? Should the indexed rent be compared to the initial rent, or to the last rent agreed between the parties?

The French Supreme Court, in a judgment of 9 July 2014 (No. 13-22.562), provides a clear answer: to determine the quarter variation, the indexed rent claimed at the date of the review request must be compared to the last price fixed by the parties' agreement, excluding indexation. In other words, increases resulting from the indexation itself are not taken into account. This decision changes the game for many contracts.

The Facts: A Common Story

Mr. Dupont, owner of an office building in Grenoble, leased premises to TechInnov Ltd in 2000. The lease provided for an annual rent of €100,000, with an indexation clause based on the construction cost index. Each year, the rent was automatically revised. In 2007, the parties agreed on a new rent of €120,000, still with indexation. In December 2009, Mr. Dupont calculates the indexed rent: it reaches €150,000. That is an increase of 50% compared to the 2007 rent. He then sends a review request to his tenant, based on Article L. 145-39.

TechInnov Ltd refuses, considering that the variation should be calculated in relation to the initial rent of 2000, not the rent agreed in 2007. According to them, since indexation had been applied since 2000, the 2007 rent already included indexations, and the variation was only 20% compared to the initial rent. Mr. Dupont brings the case before the Grenoble High Court, which rules in his favour. The tenant appeals. The Grenoble Court of Appeal upholds the judgment: the reference rent is that fixed by the parties' agreement in 2007, excluding indexation. TechInnov Ltd appeals to the Supreme Court.

Before the Supreme Court, the tenant argues that the contractual rent includes indexation and that the variation should be measured from the initial rent. The Court rejects this argument. It recalls that Article L. 145-39 aims to allow a review when indexation has created a gap of more than one quarter compared to the last price agreed between the parties. Now, this last price is the one freely negotiated by the parties, excluding indexation. The judgment is partially quashed on another point, but the principle is confirmed.

The Reasoning of the Court — Dissected

The Supreme Court relies on Article L. 145-39 of the Commercial Code, which provides: "The parties may, notwithstanding the application of Articles L. 145-37 and L. 145-38, request a review of the rent when, by operation of the indexation clause, the rent is increased or decreased by more than one quarter compared to the price previously fixed contractually." The text is clear: it refers to "the price previously fixed contractually."

But what does this mean in practice? The Court specifies that this price is the last rent fixed by the parties' agreement, i.e., the amount agreed between them, excluding indexation. In other words, if the parties agreed on a rent of €120,000 in 2007, it is this amount that serves as the reference, not the initial rent of €100,000. Subsequent increases due to indexation are added to this amount to calculate the variation.

However, note: the Court distinguishes between the "contractual rent" (fixed by agreement) and the "indexed rent" (resulting from the application of the indexation clause). To determine whether the 25% threshold is crossed, one compares the indexed rent at the time of the request to the contractual rent excluding indexation. What few people know is that this interpretation has been consistent since a judgment of 10 July 2013 (No. 12-19.148). The 2014 decision merely confirms and clarifies this case law.

undefined, I have come across cases where landlords were refused a review on the grounds that indexation was not taken into account. This decision supports them: indexation is an automatic mechanism, but review is an autonomous right based on the gap between the negotiated rent and the indexed rent.

What This Changes for You — Practically

For landlords: if your tenant agreed to a fixed rent (excluding indexation) a few years ago, and indexation has pushed the rent up by more than 25%, you can request an upward review. Example: rent agreed in 2015: €50,000. In 2023, indexation brings it to €65,000 (i.e., +30%). You can request a new fixed rent, potentially higher. Conversely, if the decrease is more than 25%, the tenant can request a downward review.

For tenants: be wary of old leases where indexation has had little effect. Check the rent history. If the rent was fixed long ago and indexation has increased little, you might benefit from a reduction if the market is trending downwards. In Grenoble, a tenant of offices in the Europole district obtained a 15% reduction after showing that the indexed rent was 30% below the market rent.

For purchasers of a leased property: during due diligence, request the history of rents and indexations. A gap of more than 25% can be an opportunity or a risk. If you buy a building with a tenant, be aware that the tenant can request a review as soon as the threshold is crossed.

How to react? If you notice a gap of more than 25%, send a review request by registered letter with acknowledgement of receipt. The starting point is the date of the request. If refused, take the matter to the judicial court within two years.

Four Tips to Avoid This Type of Dispute

• Draft a clear indexation clause: specify the reference index, review date and calculation method. Avoid vague formulas like "according to the applicable index."
• Regularly update the base rent: Every 3 to 5 years, negotiate a new rent with your tenant to prevent indexation from creating too large a gap. This secures both parties.
• Keep all amendments and agreements: If you modify the rent during the lease, formalise it in writing. Without an amendment, the last contractual rent is that of the initial lease.
• Monitor the index trend: Each year, calculate the indexed rent and compare it to the contractual rent. As soon as the gap approaches 25%, anticipate a review request.

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Further Reading: Related Case Law and Developments

This decision is part of a consistent line. Already in 2013 (Civ. 3e, 10 July 2013, No. 12-19.148), the Supreme Court held that the rent to compare is the one fixed by the parties, excluding indexation. In 2016 (Civ. 3e, 16 June 2016, No. 15-17.588), it specified that the review request may cover a period prior to the request, but without retroactivity beyond the date of the request. The trend is therefore towards protecting contractual balance: indexation must not create excessive gaps without the possibility of correction.

For the future, judges are likely to be increasingly vigilant about automatic indexation clauses, especially in times of inflation. Commercial leases entered into before 2008 (date of the reform of Article L. 145-39) are particularly affected. If you have an old lease, have it re-examined.

What You Absolutely Must Remember

FAQ:

1. When can I request a rent review? As soon as the indexed rent (by application of the indexation clause) has increased or decreased by more than 25% compared to the last rent fixed by the parties' agreement (excluding indexation).
2. How to calculate the 25% threshold? Take the indexed rent at the date of your request. Divide it by the last contractual rent (excluding indexation). If the result is greater than 1.25 or less than 0.75, the threshold is crossed.
3. What are the deadlines? The request must be made by registered letter. If refused, you have 2 years to take the matter to court. The review takes effect from the date of the request.
4. Can I request a downward review? Yes, the text also provides for a decrease of more than one quarter. The tenant can request a review if the indexed rent has fallen by more than 25%.
5. What if the lease does not specify a contractual rent? The contractual rent is the one mentioned in the initial lease or in the last amendment. In the absence of an amendment, it is the initial rent.

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