Colliers is pleased to offer 5555 Winghaven Blvd for lease, a 73,840-square-foot Class A office building located in the heart of O’Fallon, Missouri. This single-tenant property delivers exceptional functionality with a generous 5.4/1,000 RSF parking ratio, making it ideal for companies seeking a high-visibility, employee-focused workspace. The building’s location provides excellent access to major highways, nearby amenities, and a strong labor pool. Originally constructed in 1999, the property has been thoughtfully updated with recent renovations to meet modern office demands. Tenants will enjoy an inviting and professional environment, including a full-service on-site café—a rare convenience that enhances employee satisfaction and productivity. With high-quality finishes and a well-maintained exterior, 5555 Winghaven Blvd is a standout leasing opportunity in the St. Charles County office market.