Jewel Box House

The Jewel Box House is a comprehensive renovation of a three-story historic brownstone in Park Slope, Brooklyn. We reconfigured the plan and refined the interiors to bring modern functionality to a family home, while carefully preserving the exceptional millwork and detailing that give the house its character. As in all our historic-home projects, the design lives in the productive tension between preservation and intervention - the old and the new set beside one another, each amplifying the other.

Architectural sketch of an interior room with open doors, a table, and chairs, surrounded by light fixtures and decorative elements.

Photography by reBuild Workshop


The Plan

We reconfigured this historic brownstone into a two-unit residence, with an owner’s duplex occupying the upper two floors and a separate rental apartment at the garden level. The owner’s unit is organized around a generous kitchen and dining space that opens directly onto a new rear deck through French doors, strengthening the connection between interior living spaces and the outdoors. A powder room and storage sit at the center of the parlor level, letting us integrate new building systems efficiently while maintaining a clear and open plan.

The upper level is arranged as a three-bedroom, two-bathroom residence with an additional home office, to balance  privacy, flexibility, and everyday functionality.

The house retained an abundance of original millwork and wood detailing in good condition, much of which we carefully preserved and restored. While the original dark finishes were visually heavy, selective refinishing lightened the interiors and clarified the architectural hierarchy. Key elements—such as the fireplace and interior stair—were intentionally left in a darker tone, so they emerge as focal points against a quieter, brighter backdrop.


Sustainability

We replaced  the existing gas-fired boiler with a high-efficiency, concealed split-type heat-pump system that provides both heating and cooling. All existing windows and skylights were upgraded to high-performance units approved by the NYC Landmarks Preservation Commission, to improve  comfort and energy performance, while respecting the building’s historic character. The exterior building envelope was insulated well beyond code requirements, thereby significantly reducing energy demand and improving year-round thermal comfort.

Living room boasts restored and refinished bay window and great southern light.
Elegant fireplace with decorative white mantel, gold-framed mirror, vase of flowers, and artistic sculpture; flanked by two wall sconces and gold bird statues on the hearth. at a Park Slope Brooklyn brownstone project
Interior view of a vintage staircase with wood railing and floral wallpaper - at a Park Slope Brooklyn brownstone project
The new widened and reconfigured kitchen is the jewel piece of the house. Among other things, it features quarried marble countertops and backsplash, and custom wood cabinetry.
Modern kitchen with marble countertops, cream cabinets, gold hardware, gas stove with blue pot, and glass doors.A jewel-box renovation of a 3-story historic Brooklyn Brownstone aimed at bringing all the modern functionalities to a growing family
New French doors at the kitchen open up to an outdoor seating area.
Cozy narrow room with a white sofa, bookshelf, window, rug, and framed pictures. at a Park Slope Brooklyn brownstone project