Seattle’s 901 Fifth Avenue, a nearly fifty-year-old high rise centrally located in the city’s business district, underwent a major improvement project that optimized outside air flows to the building's systems based on occupancy, temperature, and indoor/ outdoor air quality to significantly improve overall EUI (Energy Use Intensity) and energy costs.

O’Brien360 was privileged to work with a highly motivated onsite engineering team that utilized its in-depth knowledge and experience of 901 Fifth to facilitate the building’s improvements and performance documentation. The 901 Fifth team chose a pathway of recertification using Arc, a measurement and verification platform that requires monitoring of energy, water, waste, indoor air quality, and human experience including occupant surveys.