Abstract: An expandable/contractible furniture component is configured for attachment to a partition system to provide an adjustable structure adapted to adjust with the partition system as the partition system is adjusted to provide different office sizes. The furniture component includes a corner shelf attached to the partition system, and in-line shelves also attached to the partition system. The in-line shelves are telescopingly adjustable into the corner shelf so that the plan dimensions of the shelves are adjustable concurrently with the partition systems to provide storage surfaces and shelves that extend and completely fill at least one dimension of the office. An in-line telescoping straight shelf construction and a two-way telescoping corner shelf construction are also disclosed.