The Cahill Building at 840 Summer Street offers versatile flex space in the heart of South Boston’s dynamic Seaport district. This 60,000-square-foot masonry building combines a historic industrial character with practical modern improvements, making it well-suited for businesses seeking a mix of office, light lab, and storage capability. The property is equipped with 24-hour access, CCTV-monitored common areas, and energy-efficient features including updated windows. Current availability includes approximately 1,991 square feet of adaptable space featuring an 11-foot clear height, one drive-in bay, and an exterior dock door for streamlined loading. On-site parking is available by arrangement, complementing excellent public transit options nearby. The building’s layout and infrastructure provide flexibility for professional firms, creative studios, or lab-focused users who require accessible space with functional load-in features. Located within walking distance of Castle Island and the Seaport’s amenity-rich environment, 840 Summer Street delivers exceptional convenience to major transportation routes, Logan International Airport, and downtown Boston. Its industrial zoning and build-out potential make it an attractive choice for businesses looking to position themselves in one of Boston’s most active and rapidly evolving commercial corridors.