Construction of one of the most advanced and heavily-instrumented facilities in the United States for developing and validating low energy integrated building systems. The net zero “Facility for Low-Energy Experiments in Building” or FLEXLAB featured construction of the world’s first rotating test bed. The “lazy-susan” building tracks the sun from the southeast to the northeast, and enables scientists to run full-scale, dynamic mock-ups to measure and compare energy use of various building components. In addition to the rotating test bed, three static test beds were also built. The structure includes highly insulating envelope components, low energy facades and lighting systems, integrated controls hardware and protocols. Overaa collaborated closely with the US Department of Energy and LBNL to resolve design issues during preconstruction and continuously throughout the project.