This is the thermal storage tank. The tank heats water which is then fed into the building's heating and cooling system. Chilled beams throughout the building will use this water to keep things comfortable for tenants and visitors. Stone34 is enrolled in Seattle's Deep Green Pilot Program, encouraging developers to use more sustainable, energy efficient building methods. Skanska says Stone34 was designed to reduce energy by more than 75 percent compared to similar buildings. (Joshua Lewis/KOMO News).