Is the new space under your company's ownership/management? Since you've already spent the money on the switch, it would make more sense to me to port it over to the new space due to the cost of purchasing another one later. Just make sure you have an adequate supply; most installed company switches I've seen have their own dedicated transformer, separate from other subpanels, dimmer racks and the like.
Without knowing about the size and configuration of the new space and your company, I can't really speak to a "need" for a company switch. If there is any possibility of a guest group coming in with their own equipment, having the ability to give them their own power can make things go much smoother. Renting a small distro to use with your company switch can save you time and cabling when a company comes in asking for 10 dedicated 20A circuits. Make sure that you put it in your tech info package (if you have one) and specify its capacity and location.
At the very least, think of it as a safer alternative to having Joe-Bob from some po-dunk company come through and attach jumper cables to your main panel's buss bars to draw power for his ho-made lighting rig. Not that you'd let Joe-Bob bring his kludgeboxes into your house, but at least there would be protection in place.
But, if you're still interested in getting rid of it I can suggest a few places where people in the industry might be interested in it. Be sure to check their rules about commercial posts; you may just want to say that you have one looking for a new home, and work out the money part in private.
Stagecraft Mailing List: http://stagecraft.theprices.net/
ControlBooth Forum: http://www.controlbooth.com/forums/
Or, you could always try your luck on eBay. There's a surprising amount of gear there, but most of it is in pretty sad shape. From the photo, your switch looks pretty new--I should hope so if it's never been used.