11 Homes That Take Staircase Design to the Next Level

Onwers Alex Gil and Claudia DeSimio reconfigured the space inside their 2,000-square-foot duplex, creating one open area to hold a monolithic "wedge core" to house the staircase. "The older the building, the more you can adhere to older codes, which gives you more liberty," says Gil, who heads the architecture firm Spacecutter.