XXO operates primarily as a professional resource. Event producers, luxury houses and advertising agencies call on it when they need a specific Panton chair, an Eames lounge, or a Knoll sideboard in exact condition and on a deadline. That professional function shapes everything about the place — the scale of the stock, the standard of maintenance, and the reason a 4,000-square-foot warehouse in Romainville exists at all.

The collection spans the width of twentieth-century design. Paulin, Starck, Herman Miller, Knoll, Eames, Panton, Le Corbusier — the names that surface regularly here are not accidental. They reflect a consistent curatorial eye built over nearly three decades. The owners themselves describe the interior as a mountain of vintage furniture, and the phrase earns its keep. Furniture, lighting and objects fill the space in density, but the stock is kept in working condition because clients depend on it being so.

That client list tells private buyers something genuinely useful. Hermès, Givenchy and Stella McCartney have sourced from XXO, as have advertising agencies including BBDO and BETC. These organisations require pieces that photograph well, arrive intact and match a brief precisely. The fact they return sets a useful quality benchmark for anyone considering a private purchase.

XXO's founders launched the business in 1997, pooling their own collections of vintage objects and curiosities into a shared operation. What began as a personal obsession grew into one of France's more respected design rental operations. The focus on careful acquisition, restoration and curation developed naturally from that founding instinct rather than from any formal commercial plan.

For most private visitors, the headline event is the annual December sale. Once a year, XXO opens its stock to direct purchase — a rare window when pieces that almost never reach the open market become available to buyers outside the trade. It draws serious collectors and first-time hunters alike. Exact dates vary, so tracking the sale in advance is worth the effort. Consider it a calendar fixture if you follow Paris vintage design.

The warehouse also offers a valuation service for unknown or unattributed antiques. For collectors who pick up unsigned pieces at markets, bringing them here can uncover maker, period and provenance. It is one of the more practical reasons to visit outside the December sale. Weekday opening runs Monday to Friday, 09:00 to 12:00 and again from 14:00 to 17:00, with the venue closed at weekends. Visits during those hours serve professional and trade purposes primarily, with valuations as the main draw for private collectors.

XXO sits in Romainville, Seine-Saint-Denis, east of Paris rather than within the city itself. The closest public transport is bus line 322, with a stop at Alexandre Dumas approximately 135 metres away. Metro line 11 serves the area at two stations: Montreuil – Hôpital and Romainville – Carnot, each roughly 800 to 850 metres away as the crow flies. Both are walkable at a comfortable pace. Street parking is reportedly available outside the warehouse for those arriving by car. The industrial facade offers no display windows and little signage — finding it takes a small effort, which feels entirely appropriate for a place that rewards the prepared visitor.