About 15,000 design enthusiasts walked through the San Francisco Decorator’s Showcase house last month, checking out the latest and greatest in interior design trends. But some visitors liked what they saw so much that they plunked down $25 million to buy the 9,500-square-foot Pacific Heights mansion right in the middle of the event.

Listing agent Erin Thompson of Compass declined to comment, citing an NDA, but told The Real Deal (opens in new tab) that the buyer, who is in tech, toured the home during the showcase and then returned with an offer. They paid all cash, she said, including both sides of the agents’ commission and the transfer tax, which came to about $25 million in total. The property itself went for just over $22.2 million and the sale closed on June 10, according to city records.

Owners who participate get the benefit of donated labor and materials; the owners of this year’s home, which had not sold since 1969, spent about $500,000 on the showcase renovations, but the updates were worth millions. They included the removal of an entire staircase and an add-on to another, as well as new countertops, flooring, wall treatments, and other built-in features. All of those upgrades were completed in a few short months and remain in place even after the showcase ended May 25.

As for bespoke, but removable items like the living room swing or custom light fixtures? It’s up to the new owners to decide if they want to pay the designers a little extra to keep those touches or bring in their own furnishings to finish things off.