This prefab house is built around a system of 4' by 4' concrete modules and a reusable formwork to save on costs and materials.

Purple thistles, California poppies, clover, and dandelions have all taken root in the roughly 10-inch-deep, lightweight humus and grape-husk soil in this 580-square-foot green roof. Designer Peter Liang says that he "wanted to plant a green roof for its thermal mass, but I wanted it to be as natural as possible."

Suzanne and Brooks Kelley at the back of their 1,100-square-foot guest cottage.

The owners toured this home, which surrounds a mature tipu tipu tree, while visiting relatives for the day. The brick is original to the 1947 construction.

Sliding doors by Quantum were made to look like the original panes that couldn't be saved, and they lead to a fire pit outside.

This garage space uses iconic checkerboard floor tiles to contrast the rustic barn door that provides entry to the rest of The Barn.

Another view of the garage reveals its extensive space to house vehicles and protect them from the elements.

The view!

At the top of the stairwell, a sitting area is outfitted with a vintage Eames lounge, a large Jack Goldstein painting, and a 1970s light fixture found by Marcovitz in Paris.

The kitchen features a concrete island topped with marble. Deja-Vu stools by Naoto Fukasawa surround the island. A print by Guy Gormley, as well as a painting bought during holiday in St. Tropez, hang on the walls.

Take a look at some of the most exciting, sustainable buildings around the world, and you may notice something they have in common: green roofs, or rooftops covered with a thin layer of soil to allow for grasses and other low-lying plants to grow.

New Depths Inspired by a local winery, George Kyprianou wanted a glass top on his subterranean wine cellar. The interior is lit, casting soft light into the living space at night and revealing the 132-year-old stone foundation. The three-quarter-inch glass lid sits flush with the floorboards; it opens with an ingenious device that Kyprianou devised using a 12-volt air compressor and a remote-controlled switch. When you push the button, the glass lifts just enough to be removed by hand.

Light Box Peter created a simple uplight at the top of the wood box by wiring together energy-efficient fluorescent fixtures typically used under cabinets and countertops. “The cheaper magnetic models hum unacceptably loudly, so make sure you get the electronic ballast types,” he warns. He then painted the cavity white to reflect light and covered them with quarter-inch-thick acrylic from TAP Plastics. homedepot.com tapplastics.com

The view of Kapiti Island is fully revealed from the tower.

A student from PS 47 in the Bronx.

The Kelleys furnished the cottage with help from Suzanne’s daughter Betsy Burbank of Betsy Burbank Interiors. Classic modernist icons, such as a Saarinen Womb chair for Knoll, a Herman Miller Eames lounge chair, and an Eileen Grey E1027 side table look at home alongside present-day pieces such as an Encore sofa (which handily folds down into a sleeping surface) from Room & Board and a Doka rug designed and produced by Stephanie Odegard. The Wohlert pendant lights from Louis Poulsen were designed by Vilhelm Wohlert in 1959, but grouped as such, they appear distinctly contemporary.

The top container contains Wardell's office—and a "napping nook" above that.

In the dining area, a one-of-a-kind table with a reclaimed Carrara marble top by NET—themultidisciplinary design firm of architect Alejandro Sticotti, with whom Nicolas works—is surrounded by prototypes of the company’s Board chair. The family dog, China, sits on a floor made of travertine tiles.

The architects added a small circular skylight to serve as a vertical focal point in the center of the fifth floor. The quarter-sawn white oak risers produce a beautiful rippled grain highlighted by the abundant natural light.

Two pieces from E15’s Shiraz sofa flank the company’s wooden Leila side tables. Hill chose to use flat paint in Benjamin Moore’s Decorators White throughout the home because it emphasizes the chalkiness of the plaster walls, making them “look almost like slate.” The sconce shown in the foreground—David Chipperfield’s Corrubedo design for FontanaArte—gives off a soft glow and replaces the dozens of paper-lampshade wall fixtures the owners found in the house when they bought it. Stewart Cohen’s zany photograph of a gun-toting Marfa resident encapsulates Barbara Hill’s offbeat brand of decorating: bright and minimal, yet darkly humorous.

While the original home was dark, like other homes of its period, the addition allowed Andrews and his team to let in an abundance of natural light.

The façade of the interwar dwelling was painted bright white and left largely unchanged, with a sole burst of color coming from a yellow DesignByThem “tomtom” letterbox. Though the extension is invisible from the street, architect Christopher Polly says it provides “significant additional freedom for the owners and their three young children to grow into.”

Photos By Rob Turner Photography

500eby Fiat Like Smart cars, Fiats are practically Lilliputian—ideal for wedging into tight parking spaces. An electric version of the popular retro-inspired car is available in California as of this summer. After a four-hour-long full charge, the zero-emission vehicle travels about 87 miles. The car’s accompanying mobile app locates the nearest charging station—useful for those trips into unfamiliar territory. fiatusa.com