
Sustainable Investment Group (SIG) is a leading U.S.-based sustainability, engineering, and ESG consulting firm that helps property owners and managers improve building performance, achieve industry-recognized green building certifications, and meet evolving regulatory and investor expectations. SIG provides full‑service support for LEED, WELL, Fitwel, BREEAM, ENERGY STAR, and other certification frameworks, along with ESG strategy, data assurance, energy audits, commissioning, climate finance advising, and healthy building solutions. Their multidisciplinary team of accredited sustainability experts, engineers, and real estate specialists collectively manages over 300 projects annually, supp…


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