The assignment? To stitch together the top three floors of a Gramercy Park building without losing the romance in the vertical. At its center, a sinuous staircase—part sculpture, part backbone—winds upward under a skylight that feels like it was borrowed from the sky itself, it’s a’ l’englaise railing catching the light just so. Parisian boiserie wraps the rooms in quiet glamour, even the marble in the bath playing along in its paneled disguise. Glass and steel partitions cut through the softness with just the right bite, bringing a crisp modern counterpoint to all that tailored wood.