Abstract: An office furniture construction includes a desk having a primary work surface and a service unit mounted over the work surface including an overhead bookshelf and side located supports for supporting the overhead bookshelf. A work table is pivoted to the worksurface for horizontal movement between an inwardly pivoted position for use by the primary user, and an outwardly pivoted position for providing an open arrangement conducive for conferencing by a group of workers. The office system further includes a bifolding security door movably attached to the service unit for articulated movement between a storage position located generally under the overhead bookshelf, and a closed secured position covering a front edge of the work surface that prevents access to the primary work area.