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The black core anchors the home and tucks utilitarian functions behind imperceptible doors. The core “connects the floors visually, enhances the verticality of the townhouse, and creates a dramatic backdrop for the hallway bridges at each level,” notes the firm.

Adair has long wished for Togo chairs, but as much as she loves the design, she tries not to be too precious about it. “We let the kids use them how they want, and they’re perfect fort furniture,” she says. “They’re really durable. It’s a design that makes architect parents happy.”

Two balconies are tucked beneath the vaulted roofline in the double-height kitchen/living room.

After: The living room overlooks the great room below. Now when you walk in the house, you can see clear out to the trees in the back—an idea sparked by an interior designer friend who commented that the most important aspect of a design is what you see when you walk in the front door.

A wall of storage in the living area has become a revolving display of souvenirs and found objects, either from their travels or shopping trips around the city. A wide window was installed to make the room feel like a treehouse. "I really wanted the home to feel bright and serene,