The reserve collection in galleries: When art becomes a hidden treasure

Behind the walls of exhibitions lies a parallel world—that of the reserve collections. These spaces, often climate-controlled and guarded like vaults, house works that may never see the light of day. But why would a gallery devote a significant portion of its revenue to storing pieces rather than selling them? The answer lies in three words: security, speculation, and strategy.

01When the gallery becomes a vault

Reserve collections did not emerge with the contemporary art market. Their history dates back to the 19th century, when Parisian gallerists like Paul Durand-Ruel realized they needed to protect their stock from economic upheavals. In 1873, after the stock market crash that shook Europe, Durand-Ruel stored hundreds of Impressionist canvases in his reserves, waiting for better days. This practice saved works by Monet, Renoir, and Pissarro, now displayed in the world’s greatest museums.

Today, the reserves of modern galleries resemble conservation laboratories. The Perrotin Gallery, for instance, has a dedicated space in Hong Kong where the temperature is kept at 20°C and humidity at 50 percent. Works are packed in inert materials, shielded from light and vibrations. At Hauser & Wirth, the reserves are even equipped with connected sensors that alert staff to any climate fluctuations. These precautions are not excessive: a Picasso canvas exposed to excessive humidity can develop mold within weeks, halving its value.

But beyond preservation, reserves play an economic role. In 2020, during the Covid-19 crisis, the David Zwirner Gallery dipped into its stock to organize online sales of never-before-exhibited works. The result: a 15 percent increase in turnover despite the closure of physical spaces. This strategy is not new. In the 1980s, the Leo Castelli Gallery systematically stored works by its star artists, like Jasper Johns, to control their distribution and maintain their prices.

025 to 10 percent of turnover: an invisible investment

Allocating 5 to 10 percent of turnover to a reserve fund is not a written rule, but a common practice among established galleries. At Gagosian, this ratio even reaches 12 percent, justified by a model that combines sales and exhibitions. For a gallery like Thaddaeus Ropac, which represents artists like Georg Baselitz or Alex Katz, this budget covers not only storage but also insurance, restoration, and logistics.

Take the example of a Julie Mehretu canvas sold for 2 million euros. Storing it in a climate-controlled warehouse costs around 1,500 euros per year, while its insurance represents 1 percent of its value, or 20,000 euros annually. Add to that transportation, handling, and sometimes restoration costs. A gallery like Marian Goodman, which stores hundreds of works, can thus spend several hundred thousand euros per year on its reserves.

Yet these costs are often offset by tax benefits. In France, galleries can deduct up to 0.5 percent of their turnover for the purchase of artworks, provided they are exhibited to the public. Some galleries, like Kamel Mennour, go further by lending their reserves to institutions like the Centre Pompidou, benefiting from additional tax reductions. In 2020, Mennour donated ten works by Daniel Buren to the museum, reducing his tax bill by 1.2 million euros.

03How to choose which works to store?

Not all works deserve a place in the reserve. The selection is based on three main criteria: speculative value, patrimonial value, and rarity. At the Chantal Crousel Gallery, which represents artists like Tatiana Trouvé or Abraham Cruzvillegas, works are classified using a method inspired by the ABC principle. Category A pieces, which represent 20 percent of the stock but 80 percent of the value, are systematically preserved. These often include historical works, like Louise Bourgeois’s drawings, or unique pieces, like Thomas Schütte’s sculptures.

Conversely, galleries avoid overstocking works by the same artist. In 2018, the Templon Gallery had to sell part of its Georg Baselitz stock to avoid saturating the market. This strategy, called "destocking," helps maintain the rarity and thus the value of the remaining works. At Hauser & Wirth, reserves are managed like a financial portfolio: works are bought, stored, and sold based on market trends. In 2021, the gallery sold a series of paintings by Mark Bradford, stored for five years, for a record 10 million dollars.

Another pitfall to avoid is underestimating minor works. Preparatory studies, drawings, or artist’s proofs, often overlooked, can gain value over time. In 2015, the Lelong Gallery rediscovered a sketchbook by Pierre Soulages in its reserves, now estimated at 500,000 euros. These pieces, though less spectacular than monumental canvases, constitute a discreet but valuable asset.

04Where and how to store? The logistical dilemma

The choice of storage location is crucial. Galleries have three options: in-house reserves, dedicated warehouses, and freeports. Each has its advantages and drawbacks.

In-house reserves, like those at the Perrotin Gallery in Paris, offer immediate access to works and constant visual control. However, they are expensive and limited in space. Dedicated warehouses, like specialist online platforms Storage in London, provide optimal conservation conditions but involve transportation and handling costs. Finally, freeports, like the one in Luxembourg, appeal for their discretion and favorable tax regime but are often criticized for their opacity.

The David Zwirner Gallery has opted for a hybrid model: its works are stored in a warehouse on Long Island, near New York, as well as in freeports in Geneva and Singapore. This strategy minimizes costs while optimizing logistics. At Hauser & Wirth, reserves are even equipped with RFID tracking systems, allowing real-time location of each work.

Conservation standards vary by material. An oil painting requires a temperature of 18 to 22°C and humidity of 45 to 55 percent, while a marble sculpture needs a cooler environment, between 16 and 18°C. Works on paper, like Cy Twombly’s drawings, must be protected from light, which can cause irreversible fading. In 2019, a fire in a Los Angeles warehouse destroyed over 1,000 works, including pieces by Jean-Michel Basquiat and Andy Warhol, due to insufficient fire safety measures.

05The reserve as a tool of power

Reserves are not mere storage spaces. They embody a discreet but real power over the art market. By controlling supply, galleries influence prices and rarity. Larry Gagosian, for example, has been repeatedly accused of manipulating prices by massively storing works by Jeff Koons or Damien Hirst. In 2008, before a record auction, Gagosian allegedly withdrew several Koons sculptures from the market, creating an artificial shortage.

This strategy is not without risks. In 2018, the Hauser & Wirth Gallery was sued by a collector for refusing to sell a Mark Bradford work, claiming it was "reserved for a future exhibition." The case, settled out of court, revealed tensions between galleries and collectors over reserve management.

Yet reserves also play a patrimonial role. Without them, major works would have disappeared. In the 1920s, Vincent van Gogh’s brother, Theo, stored hundreds of the artist’s drawings and canvases in his Paris apartment. These works, now displayed at the Van Gogh Museum in Amsterdam, would have been lost without this early conservation. Similarly, the Durand-Ruel Gallery saved dozens of Impressionist canvases by storing them for decades, waiting for the market to be ready to accept them.

06The secrets of reserves: thefts, discoveries, and scandals

Reserves hold stories as fascinating as they are troubling. In 1972, the Maeght Gallery in southern France was the victim of a spectacular theft: thieves dug a tunnel under the reserve and stole 18 works, including a Miró and a Giacometti. The pieces were recovered forty years later in a Paris apartment after a police investigation.

Other discoveries are happier. In 2015, the Louise Leiris Gallery unearthed an unknown Picasso drawing from its reserves, estimated at 2 million euros. In 2018, a Modigliani canvas, stolen in 1997, was found in a Geneva warehouse. These rediscoveries remind us that reserves are also living archives, where art history is written in the shadows.

But reserves are also the scene of scandals. In 2015, the Wildenstein Gallery was convicted of hiding 30,000 works in freeports in Geneva and Luxembourg to evade taxes. This trial revealed the extent of tax evasion practices in the art world, where reserves sometimes serve as legal hiding places.

More recently, galleries have had to adapt to new technologies. Some, like Gagosian, now use DNA markers to track their works. Others, like Unit London, have created "digital reserves" to store their artists’ NFTs. These innovations raise new questions: How do you preserve a digital work? How do you prevent counterfeiting in a dematerialized world?

07Toward sustainable and transparent reserves?

The traditional reserve model is now being questioned. First, by ecological concerns. Climate-controlled warehouses consume vast amounts of energy, and packaging materials like polystyrene or plastic generate waste. The Perrotin Gallery has adopted a "green" storage system in Hong Kong, using renewable energy and recyclable packaging. At Hauser & Wirth, reserves are equipped with solar panels and water recovery systems.

Next, by demands for transparency. Collectors and institutions are calling for broader access to reserves to better understand the available supply. The Artory platform, for example, offers a blockchain registry of stored works, allowing buyers to verify their provenance and history. In 2023, the Pace Gallery began publishing a partial inventory of its reserves, a first in the industry.

Finally, by the emergence of hybrid reserves. With the rise of NFTs and the metaverse, some galleries are experimenting with dematerialized storage solutions. The Unit London Gallery, for instance, stores its digital works on secure servers while keeping their physical certificates. This approach raises new questions: How do you authenticate a digital work? How do you protect it from hacking?

08What should your gallery take away?

Building a reserve fund is not just a logistical matter. It is a comprehensive strategy that involves financial sustainability, heritage protection, and sometimes speculation. Here are the key points to remember:

First, assess your needs. An emerging gallery will not have the same constraints as an established player like Gagosian. For a modest structure, 5 percent of turnover is often enough to cover storage and insurance costs. For an international gallery, this ratio can rise to 10 or even 12 percent.

Next, choose your works carefully. Prioritize pieces with high speculative or patrimonial value, and avoid overstocking a single artist. Use tools like the ABC method to classify your works and identify those worth preserving.

For storage, opt for the solution that best fits your budget. In-house reserves are ideal for quick access but expensive. Dedicated warehouses offer a better cost-benefit ratio, while freeports appeal for their discretion. In all cases, respect conservation standards: temperature, humidity, and light are critical parameters.

Finally, optimize financial management. Reserves can generate tax benefits, particularly through donations to museums or depreciation provisions. In France, galleries can deduct up to 0.5 percent of their turnover for the purchase of artworks, provided they are exhibited to the public.

Reserves are not just a cost. They are an investment, a tool of power, and sometimes a hidden treasure. As Ambroise Vollard, one of the first gallerists to systematize this practice, once said: "A work stored today may be worth a fortune tomorrow." Provided, of course, that you know how to protect it.