Harvard University’s first hybrid mass timber and low-carbon concrete conference center is a bold commitment to sustainability. Designed by architecture firm Studio Gang, the school’s David Rubenstein Treehouse conference center is the first building in Massachusetts to use low-embodied concrete on a large scale, says the project’s joint venture Consigli-Smoot construction management team. The team is finishing punch list items, including a cafe and retail space on the first floor set for completion in February. …Suppliers Nordik Structures, South County Post & Beam, Hasslacher Norica Timber and Westdek provided 60,000 cu ft of timber, including cross laminated timber panels of spruce, pine and fir, exterior glulam and cladding of Alaskan yellow cedar and interior glulam beams and columns of European spruce. …The three-story treehouse’s conference center is located on the top floor, which simulates climbing up treehouse rungs and stimulates creativity, says design architect, Jeanne Gang.