Though their unit was gutted, Peart and Weisgerber were highly attentive to the remaining details of Safdie’s design.

The couple’s white Bulthaup kitchen is set within a double-height volume hung with Tom Dixon Beat lights, arranged in a custom configuration by interior designer Maria Rosa Di Ioia. Overhead, Cubit shelving artfully displays books and objects, accessible by a glass-walled footbridge added during the renovation.

They restored small alcoves to rooms including the office (shown here) and living room and worked carefully with the existing windows. They also hunted down a craftsman, Marc Ablasou, to install oak floors in a herringbone pattern—a touch that subtly complicates Safdie’s aesthetic. In the office, the mirrored console is vintage and the Grand Prix chair is by Arne Jacobsen for Fritz Hansen.

In the living room, a Lake credenza by BDDW is topped with a Bauhaus chess set and a portrait of Ernest Hemingway by the artist Yuriy Rudnev.

“We wanted a space for entertaining groups, and also ourselves, that felt open—almost like a loft,” says Peart of the couple’s mezzanine-level living room.

The walls in the downstairs den are covered in Deborah Bowness’s Genuine Fake Books wallpaper and a set of String bookshelves. The leather chesterfield sofa is by Natuzzi.

In the couple’s art-filled living room, a vintage coffee table sits atop a rug by Gunta Stölzl, purchased from Design Within Reach. To accommodate get-togethers with friends and family (Peart’s twin brother, Dexter, lives in a neighboring unit with his wife and daughter), they sought a sofa that could hold 10 to 15 people at a time. The George sectional, designed by Antonio Citterio for B&B Italia, fit the bill.