By Katlean de Monchy–

The house at 279 Mitchell Lane in Bridgehampton was decorated to within an inch of its life. Some 20 designers and decorators had  worked up until the last minute, backed by PR people, investors and friends to make sure the flowers were in place, tape removed, the punch list was checked off, windows were cleaned, everything ready for the opening night crowd, due at 6pm in their white sundresses and heels.

Katlean de Monchy and Iris Dankner, the founder of Holiday House

Here they came! The 9,600-square foot, seven-bedroom, nine-bathroom, three-half-bath house is being offered by Corcoran for $12.955 million. So in a sense the Holiday House Hamptons, the proceeds from which would go to support breast cancer research, is also an open house for anyone interested in having a look.

Debra Halpert, Susan Breitenbach

It was ideal as a show house, offering so many rooms for the designers to decorate: a great room, a loft, a bridge that Christian Soriano claimed, a media room, an office, all those bedrooms and bathrooms, a guest house, a loft, an outdoor shower with hot tub and spa. A heated pool. Private guest quarters. A breakfast area. And a bonus room.

Lounge design by Christian Siriano

Siriano, best known for his elaborate gowns for the red carpet, was recruited to do a lounge area in a transitional space on an upper floor. He managed to install a cheerful, inoffensive gestural painting by Jason Craighead, and several of his own books, along with a low modernist sofa, a primitive stool  and a blobby coffee table holding one of his own books, a book on Raphael and a copy of Verve.

Andrea Stark, Kenny Alpert, Iris Dankner

Guests included Iris Dankner, the founder of Holiday House, Jean Shafiroff, Andrea Stark of Stark carpets, Debra Halpert, Susan Breitenbach of the Corcoran Group, the designer Kenny Alpert, the builders of the house, and Campion Platt, who used the mantra of luxurious summer fun in his design, which he did with Kim Dent design. Platt was there with his wife, Tatiana, and their three smart-looking children.

Andrea Stark’s daughter, Ashley Stark Kenner, is the head of Ashley Stark Home, which did one of the rooms at Holiday House Hamptons.

Campion Platt, his wife, Tatiana, and their children

Frederico Azevedo did the landscaping. Interiors were done by Collette Home, Kim Radovich Interior, Lola Tucker Interior Design, Barbara Ostrom & Associates, Blake & Emily Interiors, Brianna Scott Interiors, Elsa Soyars Interiors, Fish Row Designs, KRID Studio, Amy Storm & Company and Melanie Roy Design among others.

Thom Filicia, of “Queer Eye” and the Thom Filicia Home collection was a guest designer.

Jean Shafiroff, who was honorary chair of the event, and Andrea Stark

There will be special events planned on weekends throughout the rest of the summer. On July 22 there will be a book signing from 12pm to 2pm by Vicente Wolf, who will be accompanied by the event designer Preston Bailey.

Sam Fowler, Frederico Azevedo

Proceeds from tickets sales will go to both the Ellen Hermanson Foundation and the Breast Cancer Research Foundation.

The show house will run through August 27.