A modular "bridge" section is disclosed having a seat frame assembly and a detachable seat back assembly supported therefrom. The seat frame assembly and the detachable seat back assembly are upholstered to define an aesthetically pleasing seat section which can be installed between two seat sections or, alternatively, which can be used as an armless end unit of a modular sectional arrangement. The detachable seat back assembly is further defined by an improved linkage mechanism for use with a retractable or "flip-down" sofa table comprising a pair of pivotable links, a centerboard mounted on one set of the links, and an upholstered cover which covers and aesthetically conceals the linkage mechanism and centerboard from view. Counter-balance means are provided to assist movement of the table between open and closed position.