4 DECKER
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2026 | Cambridge, Massachusetts
4,650 SF | 2 Units | 8 Bed | 8 Bath
Under ConstructionCambridge adopted a bold new zoning that embraces urban density—taking cues from larger American cities and the compact village patterns of Europe. Unlike New York brownstones, these new rules still require air-space between structures, which pushes designers toward a new, slender vertical typology that steps beyond the classic New England triple decker. This represents Group Design Build’s first attempt at this emerging typology.
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The developer needed strategies to reduce cost and increase long-term value in order to make the project viable.
Working collaboratively, the architecture team identified key moves that unlocked the opportunity. By retaining and repurposing the existing foundation, introducing cost-effective helical piles at the rear expansion, incorporating single-stair compliance to maximize efficiency, and designing a fourth-floor “grow space” that could be finished by occupants over time, the project gained the financial and regulatory leverage necessary to proceed.
Although delivered initially as a simple core-and-shell space, the fourth floor was positioned to capture panoramic views of Cambridge and Boston. That vantage point significantly enhanced market appeal, offering buyers the potential for a future finished level with exceptional light and outlook—adding perceived value without requiring full upfront build-out costs.
The project design incorporates high performance assemblies with Net Positive capacity. A Solar PV canopy protects outdoor living with panoramic vistas of Cambridge, and Boston.
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