Hi...
A few random comments as I'm walking out the door for work:
* the scale/ratio of the floor looks off. It looks too big and like it's stretched too long.
* the pipe near the ceiling - I think the corners where it bends should be filleted/chamfered a bit, to round them off. If it's PVC pipe, I don't think it bends that sharply
* the shadows by the desks are darker/stronger than the shadows of the coffee tables. Be sure to use AO (under the special effects tab).
* I'd turn some of the chairs slightly, to avoid the repeated identicle-ness
* maybe some magazines on the coffee table?
* the bottom of the window closest to the camera looks a bit blown out, but it could just be a sunny day.
* Nice reflections in the frosted glass on the left
* nice wavy surface on the ceiling - my work has something like that in it's lobby, too - not sure why... hehe
* nice rug/foot-wiping-rug by the front door
Keep the WIPs coming!