This office building is located in downtown Seattle, WA, and JGL Acoustics, Inc. was involved in the design of the noise and vibration control of the HVAC system. This building has a unique custom rooftop unit which uses 9 plenum fans that act in parallel, but are not physically arranged in parallel inside the unit. The rooftop unit covers a major portion of the roof, and the goal was to achieve low background noise levels in the top floor offices, many of which were directly under the HVAC equipment. The noise from the reciprocating compressors was one of the main concerns with this project. The custom unit was installed on a seismic rated spring isolation curb manufactured by Mason Industries, and the developer and occupant were equally pleased with the results.