This paper discusses the unique features of a multistory office building thatssuccessfully permit most of the space to be daylighted and the electric lights to besdimmed by a cost-effective centralized system. This system includes: the use of lightsshelves, sloped ceilings, and proper building orientation and symmetry, and suppliessonly the ambient illumination. Measurements of the daylight illumination levelssand the performance of the lighting control system indicate that daylighting cansprovide over 70% of the required ambient illumination through the year. Based onsthe installed cost of the lighting control system, its payback period is 2.21 years.