A 100,000-square-foot (9,300 sq m) project in an emerging transit district in Boulder, Colorado, is making the business case for net-zero-energy (NZE) multitenant leased office buildings, including lower operating costs, higher profits, reduced carbon emissions, better recruitment and retention for tenants, and happier, healthier, and more productive employees. The new $40 million Boulder Commons, a mixed-use office/restaurant/retail project in two adjacent buildings, is one of the largest NZE multitenant commercial buildings in the United States, according to New Buildings Institute (NBI) data.