When two 20-something sisters needed New York Apartment Interior Design, they enlisted designer Kati Curtis to help them find the perfect apartment. “They had first come to us to help them find something that was in a healthy building,” says Kati—one of the sisters has a chemical sensitivity that renders prewar homes with lead paint a no-go—so she pointed them toward a new build in Chelsea. Located in a LEED-certified building, it checked most of the “green” boxes. Its hyper-contemporary all-white interior, however, was hardly befitting of the young clients’ eclectic tastes.