Sidewalk Labs and Collaborators Design a 35-Story Timber Building

The recently revealed Proto-Model-X building would reach new heights for timber.

1 minute read

January 28, 2020, 9:00 AM PST

By James Brasuell @CasualBrasuell


Cara Eckholm shares the newly revealed details of a net-zero, timber building that would reach 35 stories if built.

The building, referred to as Proto-Model-X, or PMX, is currently in the "proto-model" stage. A large collection of design and engineering firms worked with Sidewalk Labs to create the design. Eckholm credits Aercoustics, Aspect Structural Engineers, Atelier Ten, CadMakers, Gensler, Integral, JE Dunn Construction, Michael Green Architecture, RDH, Sweco, and Vortex Fire for the current status of the design. 

As Eckholm notes in the article, 35 stories has yet to be achieved by a timber building. The proto-model stands as a "digital proof-of-concept" for the idea:

The concept is borrowed from manufacturing, where it’s common to design one perfect “widget” before producing them en masse in a factory. With PMX, our “widget” is a 3D building model rendered in Autodesk’s Revit, a popular building design software, and hosted in BIM 360, a cloud-based tool that stores technical information about the building.

Eckholm's article serves to introduce two explorations of the concept, each with their own article (Exploration 1 and Exploration 2) on the Sidewalk Labs website.

Friday, January 24, 2020 in Sidewalk Talk

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Use Code 25for25 at checkout for 25% off an annual plan!

Redlining map of Oakland and Berkeley.

Rethinking Redlining

For decades we have blamed 100-year-old maps for the patterns of spatial racial inequity that persist in American cities today. An esteemed researcher says: we’ve got it all wrong.

May 15, 2025 - Alan Mallach

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

May 21, 2025 - Diana Ionescu

Rendering of California High-Speed Rail station with bullet train.

California High-Speed Rail's Plan to Right Itself

The railroad's new CEO thinks he can get the project back on track. The stars will need to align this summer.

May 19, 2025 - Benjamin Schneider

Red SF Muni ticketing machine.

San Francisco Muni Raises Fares a Second Time

A 10–cent fare hike for adults is part of the agency’s plan to chip away at a growing budget deficit.

May 21 - San Francisco Examiner

Electric car charging station with several Chevy Bolts charging in parking lot of store in Bellingham, Washington

Electric Grid Capacity Could Hamstring EV Growth

Industry leaders say the U.S. electric grid is unprepared for the increased demand for power created by electric cars, data centers, and electric homes.

May 21 - GovTech

Top view new development riverside residential and commercial neighborhood with vacant land in Texas, USA.

Texas Bill Supports Adaptive Reuse in Commercial Areas

Senate Bill 840, which was preliminarily approved by the state House, would allow residential construction in areas previously zoned for offices and commercial uses.

May 21 - The Texas Tribune