A California architectural engineering, construction management and forensic consulting firm working since 1987 on why buildings fail to perform — envelope, waterproofing, mechanical and fire-safety defects — and giving expert testimony on the result. Its published work includes the fire-safety findings at San Francisco’s Millennium Tower, where smoke-bomb testing showed smoke travelling through wall cavities between storeys: a compartmentation defect argued as a construction defect rather than as a fire investigation.