John Lum Architecture conceived a glass bridge that connects the main house and the guest quarters; the bridge also acts as a canopy for the front door. Photo by Adam Rouse.

“There’s a huge value in taking older homes that were poorly conceived and reworking them to make them relevant,” says architect John Lum, citing a recent article that suggested that “the greenest thing to do, is to be pragmatic and save as much as you can. But it’s a balancing act.”

Such was the case with a Mediterranean-style dwelling in Sausalito, built in 1991, that Lum—the founding principal of an eponymous firm based in San Francisco—was tasked with transforming. Introducing low-maintenance materials such as Kebony wood and cement plaster, Lum retained an estimated 80 percent of the existing exterior walls while still managing to conjure a modern, light-filled abode that thoroughly suits his client and showcases the spectacular vistas of the San Francisco Bay. The programming focused on designing for the residence’s then single, now married occupant and his art collection. Lum and his team, which included project architect Michael Morrison and designer Ryan Michka, also took into account that the client’s finance job allows him to work entirely from home. (Indeed, with so much of his daytime hours spent at his desk, the study was positioned to emphasize the panorama.)

For the living room, Nicole Hollis selected a Christophe Delcourt sofa, Nakagawa Mokkougei cocktail tables, Vincenzo De Cotiis side table, Blanche Jelly side table and Markus Haase sconce. Photo by Douglas Friedman.

Once a warren of rooms—“claustrophobic and a mess,” in the architect’s words—Lum simplified the configuration of the lower level, yielding a statement-making entrance. “You have this amazing two-story volume,” he says. “The view from the back of the house is so dramatic. My goal was to have nothing in the way of that.” From the front door, the sight line now runs past the open-plan living, dining and kitchen area—beyond which are the bay and downtown San Francisco.

In the entry, Lum relocated the staircase, devising a cantilevered design. A smoked-glass catwalk and a large skylight coax natural light into what was previously the darkest part of the house. A striking slatted sunscreen attached to the skylight is functional, reducing the heat plus filtering light, as well as aesthetic. Its V-shape “reads almost like the wings of a bird,” says Lum, who modeled both flat and angled versions of the sunscreen before ultimately proceeding with the latter.

The kitchen features stools by Nicole Hollis, sconces by Vincenzo De Cotiis and white oak cabinetry by Midland Cabinet Company topped with Caesarstone. Photo by Douglas Friedman.
A custom-designed table by Nicole Hollis anchors the dining area, which is joined by a David Weeks Studio chandelier, chairs by Jean-Michel Frank and Adolphe Chanaux and a Pae White tapestry. Photo by Douglas Friedman.

Works by contemporary artists Jim Lambie and Tomás Saraceno come into view as you ascend the stairs. The second floor contains the primary suite, a lounge and another striking architectural element: a glass bridge that connects the 3,500-square-foot main house to the guest quarters. (On the outside, the bridge serves as a canopy for the front door.)

The interior finishes, chosen by designer Nicole Hollis, are decidedly neutral (think: shades of gray, black and white). Natural materials— such as oak flooring and cabinetry, plaster walls and a marble fireplace surround—abound. Sculptural furniture counterbalances the lines of the steel casement windows, including the living room’s curved Christophe Delcourt sofa and pair of Nakagawa Mokkougei cocktail tables.

Ascending the cantilevered staircase, wall art by Jim Lambie and a hanging sculpture by Tomás Saraceno come into view.
Photo by Douglas Friedman.
Photo by Douglas Friedman

The artwork injects color throughout, perhaps most notably beneath the stairs, where Richard Artschwager’s Exclamation Point commands attention. “I love the fact that even though it’s blue-chip-level art, it has a certain playfulness about it,” says Lum of the client’s acquisitions.

A guest bath, clad in bald cypress, benefits from natural light. Photo by Douglas Friedman.

Although Lum didn’t start from scratch with this house, the end result is unrecognizable—its potential unlocked after much reimagining and reorganization, including flipping the placement of the living and dining rooms. “For me, it was obvious from the day I walked in that this is what should be done to it,” says Lum of the two-and-a-half-year undertaking. “I don’t know if it’s because I’ve been doing this for 27 years, but you kind of just know.”

The client’s art collection extends to the outdoors with a bronze sculpture by Eva Rothschild.
Photo by Adam Rouse