The Alliance for Sustainable Colorado, the owner and operator of the Alliance Center, undertook a four-year “transformation” project of the 41,000 square feet building, constructed in 1908. In 2010, the five-story brick building, a former warehouse, was configured in a traditional, private suite layout that had little natural light and limited space for gatherings or collaboration. The renovation sought both to “create a cost-effective, high-performing building model” as well as to identify a replicable approach that could be applied to other commercial offices and historic buildings.