The orbital office complex was a Starfleet space station in Earth orbit near the drydock where the refitted Enterprise lay, and the point from which Kirk travelled to his ship.
The complex appears in Star Trek: The Motion Picture. Admiral Kirk, having talked Starfleet into giving him back the Enterprise to meet the V'Ger threat, beams up to it from Starfleet Headquarters in San Francisco. Because the ship's own transporters are not yet working, Scott meets him and flies him across in a travel pod.
The short journey becomes a long, admiring circuit of the rebuilt Enterprise, one of the best-remembered sequences in the film.
The complex is shown as a cluster of cylindrical modules with docking ports for travel pods and work craft, busy with small vehicles servicing the nearby drydocks.