  We address a class of systems for which the solution to an H-infinity optimal
control problem can be given on a very simple closed form. In fact, both the
control law and optimal performance value are explicitly given. The class of
systems include models for large-scale systems such as temperature dynamics in
buildings, buffer networks and transportations systems. Furthermore, the
structure of the control law is suitable for distributed control of such
large-scale systems, which is illustrated through examples.
