Sutton Place Duplex Apartment

The clients approached CCA with the idea of purchasing the 2-Bedroom condo above theirs and combining the two apartments into a single duplex. The pre-war (1928) apartment building was an early reinforced concrete structure and would require creating a new opening in the structural floor slab to accommodate a new stair. Our structural engineer, Rodney Gibble, provided a spare and elegant solution that required no new perimeter beams. The client agreed that all new work should be clean and contemporary in contrast to the more traditional existing elements.

This project was designed in collaboration with Joseph Costantin and Barbara Ostrom Associates (interior decoration)

A spiral staircase with wooden steps and glass railing, viewed from above, with a modern chandelier hanging above.

Freeform Stair from the Upper Level

Elegant spiral staircase inside a luxurious home, with modern chandelier lighting and a view into a living room with large windows.

Freeform Stair from the Entry

Spiral staircase with wooden steps and a metal railing, leading to a second floor with a ceiling opening. There are hanging spherical lights and a tall green glass sculpture next to the staircase. The walls have striped wallpaper and a framed floral painting.

Entry Foyer

Stair Opening Construction Sequence

Two workers are using a core drill to drill into a concrete floor to create new spiral stair opening, with construction tools and materials visible around them.

Initial Floor Slab Cutting

Construction site showing a hole in the floor with a reflective surface, a room with an exposed wall and door frame, and a partially built wall with visible wooden studs and metal framing. Hanging electrical wires are also visible.

Rough Cut Stair Opening from Above

Interior of a house under renovation, showing a large hole in the ceiling with exposed framing, wiring, and concrete. Construction materials and tools are visible including a scaffold, ladder, and plastic sheeting covering furniture.

Rough Cut Stair Opening from Below

Architectural sketch of a spiral staircase inside a building, with colored shading indicating walls and windows.

Sketch Concept

A sketch of a modern architectural design with curved and angular structures, colored with shades of green, yellow, and blue, featuring open spaces and pathways.

Sketch Concept

Sketch of the new spiral stair hall with notes and measurements, including a dome and arched element, with handwritten annotations.

Sketch Concept

Interior view of a spiral staircase with wooden steps, a glass and metal railing, a large painting of flowers on the wall, a decorative green glass sculpture, and a ceiling with modern hanging lights.

Freeform Stair from Living Room

Frosted glass window with intricate tree and landscape designs etched into it.

Custom Sandblasted Screen between Stair Hall and Primary Bedroom Suite

Architectural technical drawings of a custom spiral staircase showing floor plans, elevations, and detailed measurements.

Stair Working Drawings

Apartment Plans Here
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