Abstract: An enclosure with an adjacent auxiliary fold-out room is useful as a utility building for cellular telephone equipment. The auxiliary fold-out room is selectively positionable in a collapsed configuration and alternatively positionable in a expanded configuration. In the collapsed configuration the auxiliary fold-out room lies against the enclosure and in the expanded configuration, panels of the auxiliary fold-out room define an enclosed space adjacent an access opening of the enclosure and provide cover for maintenance personnel while servicing equipment within the enclosure.