5555 Winghaven Boulevard presents a premium Class A office opportunity in the thriving O’Fallon, Missouri market. This 73,840-square-foot, single-user building offers a professional, high-quality environment designed for functionality and employee engagement. Featuring an efficient layout across three stories, the property includes a full-service on-site café—an amenity that enhances workplace experience by promoting convenience and productivity. With a robust 5.4/1,000 RSF parking ratio, including 23 executive covered spaces and EV charging stations, the building meets the needs of a modern workforce. Recent interior upgrades provide an updated, collaborative workspace with flexible and open areas, conference facilities, and private meeting rooms. Fully sprinklered and supported by modern building systems, the property also benefits from monument signage and visibility at the Winghaven entrance. Strategically located near Winghaven Boulevard and Interstate 64, the property ensures quick connections to St. Charles County and the greater St. Louis region. The surrounding area offers abundant dining, entertainment, and lodging options, complementing a strong residential base and commercial amenities. This property represents an outstanding choice for organizations seeking a long-term headquarters or regional hub in a fast-growing business corridor.