An article of furniture is disclosed. The article of furniture comprises a base frame assembly configured to support an attached seating unit. Other modules or components may also be attached to the base frame assembly. The article of furniture may also comprise a supplemental frame assembly attached to the base frame assembly to extend the size of the article of furniture and to support an additional or larger module or component. The other modules or components may comprise one or more of a casegood unit, a backrest, an armrest, a privacy panel, a console, an outlet (for power and/or data), etc. Electronic devices may be incorporated. A set of articles of furniture is also disclosed; the articles of furniture have a modular construction and can be assembled on the base frame assembly by combinations of modules and components.