US firm Montalba Architects looked to California's modernist heritage to design this boutique set up by celebrity twins Mary-Kate and Ashley Olsen.

The Row showroom – which recently won an American Architecture Award – is the flagship space for the fashion line created in 2006 by the Olsen twins, who shot to fame as TV and film stars at a young age.

The shop is located on West Hollywood's famed Melrose Place, close to a myriad of boutiques selling designer fashion by the likes of Helmut Lang and Rick Owens.

Santa Monica-based Montalba Architects completed the project in 2014, and aimed to create a residential feel across the store with lounge areas, fireplaces and artwork.

Shoppers enter through an oversized glass door, featuring a custom bronze logo knob. In keeping with the principles of modernism, the space beyond is arranged around a series of outdoor areas.

Floor-to-ceiling glass partitions slide back to open the interiors to these courtyards, one of which contains a shallow pool and another a small tree.

Light-coloured flooring is used both indoors and out for continuity between the spaces.

Garments are presented on custom, brushed stainless-steel rails, while accessories sit on steel-blade shelving.

The remainder of the material palette comprises walnut and antiqued limestone pieces, arranged against the matt-white concrete walls.

"A distinctive mid-century collection of furniture throughout, as well as lush native plantings, layer subtle colour tones and warmth into the design," said the architects.

Modernism is undergoing a revival in the US, where many of the style's best examples were built during the mid-20th century.

Other new projects that reference its clean lines and indoor-outdoor spaces include a villa in the Hollywood Hills and a Miami mansion built by a filmmaker.

Photography is by Dominique Vorillon.