At AHR in Las Vegas, the LonMark with C4SB booth theme was “Follow the Yellow Brick Road.”
It felt appropriate. Interoperability is not magic; it’s a series of bridges, from models to meaning, from intent to lifecycle, from handover to operations, and ultimately to scale.
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I’ve never seen a convergence like this.
--Kimon Onuma
Las Vegas Convention Center
Feb 2, 3, 4, 2026
No more locked data, choices, value, or experiences in buildings.
The Coalition for Smarter Buildings Foundation (C4SB) is the global community dedicated to creating, collecting, and sharing open technology, data, and standards to solve common challenges and unlock higher value, choices, and opportunities for building owners, operators, occupiers, and vendors.
Solutions built on the open standards and open source components championed by the C4SB community are delivering higher value, more efficient operations, and a better experience to real buildings today.
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