STO Building Group

STO Building Group is a family of construction management and general contracting firms built around Structure Tone, which was founded in New York in 1971. The group operates across the U.S., U.K. and Ireland, delivering interiors, base building, health care, mission-critical and life-science work. In Lower Manhattan it’s construction manager on SoMA at 25 Water Street, the largest office-to-residential conversion in the country. STO’s model combines a national network of operating companies with local delivery teams, letting it staff complex jobs in dense urban markets. The group ranks among the larger builders in North America by revenue.