Valuing an office building is not something to be improvised: unlike a residential property, its value depends above all on the rental income it generates and on the risk perceived by investors. In 2026, the French tertiary market is going through a phase of reshaping, marked by a record vacancy rate in Île-de-France, tighter ESG requirements and a gradual return of institutional investors to the best-rated assets. Sellers and buyers must therefore cross-check several valuation methods to set a realistic price. This article details the income capitalisation method, the criteria that cause yield rates to vary, and the points of attention specific to offices in the post-remote-work era.
In summary
- The benchmark method for valuing an office building is the capitalisation of net rental income (annual net rent divided by the capitalisation rate).
- The yield rate varies significantly depending on location: around 4% in Paris QCA versus 7 to 9% in the second ring or in the regions.
- The tertiary DPE (energy performance diagnostic) and compliance with the décret tertiaire have become decisive criteria for institutional buyers, with premiums or discounts of several percentage points.
- Tenant quality, the remaining term of leases and the local vacancy rate must systematically be factored into the analysis before any sale is put on the market.
The rental income capitalisation method
For a let tertiary asset, the market value is most often calculated using a simple formula: annual net rent (excluding recoverable charges) divided by a capitalisation rate expressed as a percentage. This income-based approach is preferred because it directly reflects the return an investor can expect, and it forms the foundation of any professional property valuation of an office building.
Calculating the capitalisable net rent
This is the headline rent less non-recoverable charges, projected rental vacancy and, where applicable, any rent-free periods granted to the tenant. An optimistic gross rent that has not been adjusted will invariably lead to an overvaluation of the asset.
Choosing the right capitalisation rate
The rate applied depends on the balance between return and risk as perceived by the market: the more secure the asset (prime location, strong tenant, long lease), the lower the rate and the higher the value. Conversely, a vacant building or one with a poor energy rating is subject to a higher yield rate, and therefore a lower valuation for an equivalent rent.
Yield rates by location in 2026
Location remains the primary differentiating factor for yield rates in the office market. The gaps between Paris and the provinces, or between the business core and the second ring, can amount to several percentage points, and can therefore double or halve the value of the same rental income stream.
Paris QCA and premium business districts
In Paris's Quartier Central des Affaires, prime rates are holding at around 4% in early 2026, driven by the scarcity of new or restructured supply and the return of institutional investors to "core" assets. Secondary business districts such as Neuilly show slightly higher rates, at around 5%.
Second ring and regional cities
In the Île-de-France second ring, rates can climb as high as 9.75%, while regional cities generally offer yields of 7 to 8%. These levels reflect a higher letting risk, particularly in markets where take-up is more volatile and where finding a new tenant takes longer.
The tertiary DPE and ESG criteria: the new arbiters
In recent years, energy performance has ceased to be a mere selling point: it directly determines whether the asset can enter the portfolios of major investors, and therefore its future liquidity.
A now unavoidable requirement for institutional investors
Institutional investors today most often require a tertiary DPE rated A or B before adding an asset to their portfolio. A poorly rated building sees its pool of potential buyers shrink drastically, which mechanically weighs on its sale price.
Décret tertiaire, décret BACS and works to anticipate
The "tertiary decree" (décret tertiaire) imposes energy consumption reduction trajectories, and the BACS decree imposes a building automation and control system for buildings of more than 2,000 m². These regulatory obligations generate works budgets that must be anticipated and deducted from the value of an obsolete building, otherwise the buyer will have them costed during the negotiation phase.
A value premium for high-performing assets
Conversely, new buildings meeting the RE2020 standard or buildings restructured according to HQE or BREEAM benchmarks are leased at rents 8 to 12% higher and sell at a premium of 5 to 10% compared with comparable, less efficient assets. Renovating before selling can therefore prove profitable if the valuation gap exceeds the cost of the works.
The vacancy rate, a key indicator of the local market
Beyond the yield rate, the vacancy level in the building's geographic area gives a concrete picture of the balance of power between supply and demand, and therefore of the marketing period to anticipate if the asset becomes vacant.
Vacancy in Île-de-France at an all-time high
In Île-de-France, the vacancy rate reached 11.2% at the end of 2025, then approximately 11.4% in the first quarter of 2026, compared with only 5.5% in 2019. This structural increase reflects a mismatch between a still sizeable stock of older offices and demand that is increasingly selective about the quality of the space.
Highly contrasting situations depending on the area
Some premium business districts retain low vacancy and resilient rents, whereas second-ring areas or obsolete buildings accumulate empty space and a loss of value. Before any valuation, it is essential to compare the vacancy rate of the building concerned with the average for its local market, ideally drawing on comparable property listings available in the area.
Tenant quality and lease strength
A leased office building is not worth only its headline rent: the tenant's creditworthiness, the remaining term of the lease and early termination clauses weigh just as heavily in the valuation equation.
Analyzing creditworthiness and tenant diversification
A single top-tier tenant (large group, public administration) is more reassuring than a multitude of fragile SMEs. For a multi-tenant building, diversification of activities and lease expiry dates limits the risk of simultaneous vacancy and secures the income stream over the long term.
Firm lease term and exit options
The longer the remaining firm term, the more secure the rental income stream is considered, which justifies a lower capitalization rate. Conversely, a lease close to expiry or one with three-yearly termination clauses (résiliation triennale) leads the buyer to factor in a risk premium, and therefore to negotiate the price downward.
The office market after remote working: what really changed in 2026
Contrary to a common misconception, remote working did not become more widespread in 2026: according to Apec, 94% of French companies do not envisage any change to their remote working policy this year. However, the "2 to 3 days of remote working per week" format has become firmly institutionalized, which is leading many companies to reduce the space they lease when renewing their lease rather than going back.
The announced end of "office bashing"
Several market players, including Cushman & Wakefield, describe 2026 as the year marking the end of "office bashing" and the gradual return of institutional investors to the best-positioned office assets, particularly in central business districts.
Conversions that are reshaping supply
In the face of structural vacancy in some obsolete buildings, conversions into housing or managed residences are on the rise. For a selling owner, this option must be factored into the valuation when the asset is no longer suited to the standards of the tertiary market: the "alternative usage" value can sometimes exceed the value under continued office use.
Combining several methods to make the valuation more reliable
Income capitalization is the reference method for a leased building, but it benefits from being cross-checked against other approaches in order to secure the final sale price.
The comparison method
This method consists of comparing the building's price per square metre with recent transactions involving properties that are comparable in terms of location, condition and rent level. It makes it possible to check the consistency of the result obtained through capitalisation.
Using a local professional
Given the technical nature of the exercise, the weight of ESG criteria and local disparities in yield rates, it is strongly advisable to call on a professional to make the valuation objective. An adviser with detailed knowledge of the local commercial property market will be able to refine the capitalisation rate used and position the property at the right price.
Conclusion
Valuing an office building in 2026 requires combining a rigorous financial analysis of rental income with a nuanced reading of the criteria that now determine the value of a commercial asset: location, DPE tertiaire (energy performance diagnostic for commercial buildings), local vacancy rate and tenant quality. In a market undergoing reshaping, where the gap is widening between premium assets and obsolete buildings, a reliable valuation is an essential condition for selling at the right price and within a reasonable timeframe. Relying on a commercial real estate professional makes it possible to objectively assess each of these parameters.
The expert's view
"Valuing an office building can no longer be reduced to a price per square metre: it is above all a reading of the asset's rental and regulatory risk. In 2026, I see more and more owners discovering, at the time of sale, that their building is penalised by an insufficient DPE tertiaire or by unanticipated compliance works under the décret tertiaire (French tertiary sector decree). Conversely, well-rated assets, let to solid tenants on long leases, in low-vacancy areas, continue to trade at very tight capitalisation rates, particularly in central business districts where institutional investors are gradually returning. My advice is simple: before any sale, have the building audited for its energy and regulatory aspects, analyse the vacancy rate in your area and the strength of your tenants, then have a valuation carried out by a professional capable of cross-checking the income capitalisation method and the comparison method. It is this dual approach, combined with good knowledge of the local market, that makes it possible to set a credible sale price and secure the transaction within a reasonable timeframe, even in a commercial property market as contrasted as today's."
— Frédéric Rémy, Commercial Performance Director at Capifrance
FAQ - Frequently asked questions
What is the most reliable method for valuing an office building?
The net rental income capitalisation method is the benchmark for a let building; ideally, it should be cross-checked against a comparison method based on similar transactions.
Does the DPE tertiaire really have an impact on the sale price?
Yes, an insufficient DPE reduces the number of potential buyers, particularly institutional ones, and generally leads to a discount, whereas a high-performing asset can benefit from a value premium of 5 to 10%.
Why does the yield rate vary so much from one city to another?
The rate reflects perceived rental risk: a prime location with strong demand justifies a low rate, whereas an area with high vacancy or lower demand requires a higher rate in order to remain attractive.
Can a vacant office building still be sold well?
Yes, but its valuation will rely more on an estimated market rental value and on the prospects for possible conversion, rather than on an actual rent currently in place.
Should you call on a professional to value an office building?
It is strongly recommended, as the exercise combines financial expertise, regulatory knowledge and detailed knowledge of the local market; a specialised adviser can make the valuation objective and avoid overvaluation or an unjustified discount.
Author
Frédéric Rémy – Director of Sales Performance
A real estate professional with several years of experience within the Capifrance network, I would like to share essential advice with you to help you successfully complete your property project with our advisors.
