Compulsory Purchase and PLU: The Court of Cassation Upholds Taking into Account the Increase in Value for the Owner

In the heart of Paris, an owner receives a compulsory purchase notice. Their land, once classified as an agricultural zone, has just been made buildable by a modification of the local urban development plan (PLU). The administration offers compensation calculated on the former use. Is this legitimate? The Court of Cassation ruled on 6 September 2018: the valuation of the property must reflect the new urban planning rules, even if they have not yet been implemented. A decision that changes the game for all owners affected by PLU amendments.

Who has never dreaded seeing their property undervalued during a compulsory purchase procedure? This fear is all the more acute when the urban planning document has evolved favourably shortly before the administrative decision. Too often, the acquiring authority clings to a minimalist estimate, ignoring the real potential of the land. The ruling of 6 September 2018 provides a sharp response: the judge must take into account the urban planning designation at the date of judgment, and not at the date of the public inquiry, insofar as it provides an increase in value to the owner.

Without giving everything away, let us say that this position, rendered by the Third Civil Chamber, is part of a jurisprudential trend favourable to those subject to compulsory purchase. It recalls that the right to a fair and prior compensation, guaranteed by Article 17 of the Declaration of the Rights of Man and of the Citizen, requires a realistic assessment. Let us examine together the ins and outs of this case, and above all what it means for you, owner, in Paris or elsewhere.

The facts: a story like those that happen every day

A property investment company (SCI), which we will call Emmavena, owns a large plot of land in the Paris region. This property is subject to a compulsory purchase procedure for public utility, conducted by a local authority. At the time of the preliminary inquiry, the land is classified as a natural or agricultural zone according to the PLU in force, which limits its market value.

But a twist: between the opening of the inquiry and the judgment fixing the compensation, the PLU is revised. The land is now located in an urbanization zone, with specific development guidelines favourable to a construction project. The SCI considers that this major modification must be reflected in the amount of the compulsory purchase compensation, and requests an assessment that includes this latent increase in value.

The acquiring authority does not see it that way. It relies on a private expert report to argue that the change in zoning would actually result in a decrease in value, citing technical constraints or high development costs. The Government Commissioner, whose opinion is then required, agrees with this analysis. The first instance compulsory purchase judge follows this reasoning and sets a reduced compensation. The SCI appeals to the Court of Cassation.

The case therefore reaches the highest court of the judicial order. The debate is thorny: at what date should the value of the compulsorily purchased property be assessed? And how to combine the principle of full compensation with the vagaries of urban planning? So many questions that find an echo in many files I have had to handle, from Paris to Marseille, where a change in PLU upsets the economic balance of a compulsory purchase project.

The court's reasoning — dissected

The Court of Cassation partially overturns the contested decision. It recalls a fundamental principle: the value of the compulsorily purchased property is assessed at the date of the first instance judgment, taking into account its actual use and its construction possibilities as they result from the local urban development plan (PLU) in force at that same date. In this case, the amended PLU allowed urbanization in accordance with specific development guidelines – which entitled to an increase in value.

For the judges of the law, the error of the Court of Appeal was to focus on an assessment based on a former use and on an unchallenged expert report. However, the sole ground of appeal precisely criticized the trial judges for having distorted the conclusions of the Government Commissioner (since become the "public rapporteur") and for having ignored the real scope of the new PLU. The Court clearly states that the modification of the urban planning document constitutes an objective element changing the market value. It relies on articles L. 321-1 and L. 322-1 of the Code of Compulsory Purchase for Public Utility, which require the compensation to be fixed according to the situation of the property at the date of judgment. If the PLU evolves favourably in the meantime, the owner must benefit from it, because compulsory purchase cannot deprive them of an urban planning advantage already acquired.

The formulation is decisive: "it must therefore be held that there is an increase in value". The high court does not merely censure the reasoning, it guides the continuation of the trial. It is a decision rich in lessons. On the one hand, it confirms that the assessment of the Government Commissioner has only indicative value, the judge remaining master of the compensation. On the other hand, it underlines the need for a realistic prospective analysis of the local real estate market. You may wonder: should the owner have anticipated this turnaround? Not at all: the Court requires the acquiring authority to update its offers according to regulatory developments until the final judgment.

This is not a spectacular reversal, but rather a consolidation of case law. Already in a decision of 7 February 2001 (no. 99-70.212), the Court of Cassation had held that a modification of the POS (predecessor of the PLU) subsequent to the public inquiry and prior to the judgment had to be taken into account. The decision of 6 September 2018 forcefully reaffirms this principle, adding a useful clarification: even if the Government Commissioner mentions a decrease in value, the judge may depart from it in the presence of reliable contrary elements, such as a private expert report from the person subject to compulsory purchase.

What it changes for you — concretely

For an owner threatened with compulsory purchase, this decision is a real shield. Previously, many administrations played for time, hoping that an old and restrictive PLU would freeze the assessment. Henceforth, you can demand that the value of your land includes any favourable development of the PLU occurring up to the day the judge rules. In Paris, where PLU revisions are frequent and can affect entire areas (think of the ZAC Clichy-Batignolles), the financial stakes amount to hundreds of thousands of euros. For example, a 500 m² plot going from a suburban housing zone (value €400/m²) to a buildable zone with a floor area ratio of 1.5 (value €800/m²) sees its compensation jump from €200,000 to €600,000.

Concretely, if you are in this situation, you must imperatively monitor the progress of any PLU revision procedure during the judicial phase. As soon as a modification is adopted, have it recorded in the debate by way of written submissions. Do not hesitate to produce an updated valuation by an independent real estate expert. The burden of proof lies with you: you will need to demonstrate that the change in zoning confers an effective increase in value, relying on market comparables and on the development guidelines of the PLU. This decision gives you a powerful argument to challenge an overly conservative Government Commissioner's opinion.

As for tenants evicted, they are less directly concerned, because their right to compensation relates to the loss of the business or the lease right. But a better compensated owner may sometimes be able to offer them more generous compensation. Real estate developers, on the other hand, must learn a lesson: when they acquire a property subject to a declaration of public utility, they must include in their due diligence the risk or opportunity linked to the evolution of the PLU. Better still: they can become the purchaser of a compulsorily purchased property during the procedure and take over the action for setting the compensation for their own benefit.

A procedural detail not to be overlooked: the time limit for appealing to the Court of Cassation in compulsory purchase matters is two months from the notification of the appeal decision. If exceeded, you lose any chance of obtaining a readjustment. The assistance of a specialised lawyer is essential to avoid missing these strict deadlines.

Four tips to avoid this type of dispute

Even if a compulsory purchase is often suffered, a few reflexes will allow you to optimise your compensation from the outset:

• Anticipate the evolution of the PLU. Subscribe to town hall alerts concerning revisions of the urban planning document in your sector. A simple prescription deliberation can trigger a favourable dynamic.
• Have a preventive valuation study carried out. As soon as you hear of a development project that could impact you, commission a private valuation. It will serve as a basis to contest the subsequent administrative offer.
• Do not sign any amicable agreement without legal advice. The compensations offered are often undervalued. A lawyer will be able to analyse the methodology used and negotiate an upward revision, even if it means going to court.
• Build a file of evidence continuously. Keep all letters, minutes of public meetings, extracts from registers, municipal council deliberations. They will demonstrate the urban planning evolution and the reality of the buildable potential.
• Check the PLU in force on the day of the hearing. Do not forget that the situation is fixed at the date of the judgment. If a modification occurred between the inquiry and the hearing, produce an updated extract of the graphic and written regulations.

These precautions often make the difference. I have seen a Parisian client obtain a 40% revaluation simply by producing the new bioclimatic PLU adopted fifteen days before the hearing.

Further insight: related case law and developments

The decision of 6 September 2018 is part of a consistent line. As early as 1994, the Court of Cassation (3rd Civ., 10 March 1994, no. 92-70.076) held that the modification of the POS prior to the judgment had to be taken into account. More recently, a decision of 12 October 2017 (no. 16-20.404) specified that classification in a buildable zone, even without services, induces a higher value than agricultural land. On the other hand, there is a divergence with the administrative case law: the Council of State has sometimes considered that only the situation at the date of the preliminary inquiry to the declaration of public utility should be retained. This duality of regimes creates legal uncertainty that the Court of Cassation intended to mitigate by firmly aligning the law of compulsory purchase with the principle of full compensation at the date of judgment.

The trend of the judicial courts is therefore clearly towards a dynamic valuation. For the future, one can expect that acquiring authorities will try to circumvent this rule by freezing PLU revision procedures during the contentious phase, but this is more a matter of administrative strategy than of law. In any event, the owner now has a powerful lever to obtain compensation at its fair value.

What to remember

Finally, this decision places the owner at the heart of the evaluation process, preventing them from being the victim of reverse administrative speculation. The compulsory purchase procedure, already testing, does not have to be accompanied by disguised spoliation.

Do you find yourself in a similar situation? A first 30-minute consultation with Maître Zakine (€45) can save you months of procedure — and often much more. Make an appointment →