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251 Bagley Street
Vallejo, CA 949592
United States

(415) 877-2211

As its name implies, Intermodal Structures designs, manufactures and delivers single and multi-story, steel frame buildings (intermodally) to customers located anywhere in the world. The buildings are earthquake and hurricane/typhoon proof and their moment frame design enables 40 feet of clear span without requiring any columns or structural walls. Their long life, expandability (both horizontally and vertically), adaptability to different uses over time and relocatability future proofs our buildings. 


Company Story & Vision


Company Story

iMod Structures (IMS) is transforming classrooms and how they are built.  Combining advanced technologies and progressive new approaches to building design and construction, IMS is designing, manufacturing and installing DSA approved high-performance, pre-fabricated “future proof” classrooms that are designed specifically as healthy and sustainable 21st Century learning environments. 

We have established ourselves as a leader in providing long-life single and multi-story steel-frame classrooms that are reconfigurable and relocatable. Our high performance buildings are easily and cost-effectively relocated to accommodate a school district’s shifting demographics and budget requirements. Our innovative iMod moment frame enables 40 feet of clear span, requiring no interior columns or structural walls. Our classrooms are also tech-ready, capable of integrating new innovations and digital teaching tools without interruption. IMS buildings can be transported by container ship, rail car or truck to enable their deployment to virtually any location on earth. 

Based in San Francisco, IMS was founded in 2009 by John Diserens and Craig Severance, two former members of a successful real estate investment trust focused on domestic and international markets. John and Craig bring complementary prior experience to IMS, including experience in real estate finance, sales, marketing, development, design, manufacturing and construction.  In 2011, Reed Walker joined the company, adding decades of experience as a general contractor with a focus on the modular building industry.  Reed has been instrumental in the design of the IMS iMod Building System.

In 2009, IMS formed a joint venture with one of the largest shipping companies in the world, A.P. Moller-Maersk (“Maersk”), to design, finance, manufacture and transport IMS high performance buildings to major markets around the world.  Maersk invested several million dollars into the R&D of a new technology-based high performance building system and financed initial prototype buildings.  

The goal of the joint venture was to create a building system that leverages the size and footprint of a traditional shipping container, making it easy and cost effective to transport anywhere in the world through established standardized methods,  while utilizing an innovative new building system that is reconfigurable, relocatable, sustainable and long lasting.  The iMod Building System is a result of that joint venture. 

Maersk and IMS utilized a heavy steel, innovative moment frame design to create an iMod that achieves forty feet of clear span in a multi-story configuration without requiring internal structural columns or walls or external trusses.  We also engineered an intra-floor bolting system that precludes the need to weld iMods together, greatly simplifying and expediting the process of adding (or subtracting) modules in either vertical or horizontal configurations.  

By 2011, IMS had installed its initial prototype high performance buildings in Portsmouth, Virginia, Guam, Chile and Haiti. The company dedicated its focus to the California classroom market in 2014.

To accommodate full commercial production, IMS in 2018 moved into a 250,000-square foot former Navy submarine factory on Mare Island across the bay from San Francisco.  The company received its first institutional funding from Goldman Sachs in late 2018 to expand commercial operations and its sales and marketing initiatives.