Barbara Butler has spent nearly four decades building tree houses all across the country. But when the Hayward-based timber expert spoke to SFGATE on Tuesday, she started the call with bewilderment.
Designed by Studio Gang, the 55,000-sq-ft David Rubenstein Treehouse conference center is the first building in Massachusetts to use healthier, low-embodied concrete on a large scale. January 21, 2026 ...
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