Lightbox 23 is a 2-unit net zero infill project in inner NE Portland. The project features super insulated wall, roof and sub-slab assemblies plus high performance mechanical and ventilation systems. Topping it off (literally) is a 10kW solar array on each unit. The project has been certified net zero by Earth Advantage.
The design is a split level floor plan with the floating stairs acting as the central spine. Each floor opens to the half level above and below through the open slot the stairs create. The exterior tube forms step up the facade to the corner view deck where Mt. St. Helens and Mt. Adams are visible to the north.

Lightbox 23 is a speculative project by Lightbox Portland, who is dedicated to high performance, high density modern development. 3 more Lightbox Portland / Steelhead Architecture projects are currently in process.

Steelhead Architecture uploaded Lightbox 23 through Add A Home.
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Modern home with Exterior, Metal Roof Material, House Building Type, Flat RoofLine, Metal Siding Material, and Shed RoofLine. Exterior front corner with stepping tubes Photo  of Lightbox 23

Exterior front corner with stepping tubes

Modern home with Exterior, Metal Roof Material, House Building Type, Flat RoofLine, Shed RoofLine, and Metal Siding Material. Exterior elevation showing split levels Photo 2 of Lightbox 23

Exterior elevation showing split levels

Modern home with Exterior, Metal Siding Material, Shed RoofLine, House Building Type, Flat RoofLine, and Metal Roof Material. The south unit exterior Photo 3 of Lightbox 23

The south unit exterior

Modern home with Living Room, Medium Hardwood Floor, Coffee Tables, Sofa, and Recessed Lighting. Open living space with 2-story volume Photo 4 of Lightbox 23

Open living space with 2-story volume