Open a door, put the leash on the inside door knob and close the door. Have a bed and a good chewy there for him to lay on and be occupied. I'd bring him from room to room with you if you can.
Personally, I like to occasionally have my dogs crated when I am home and doing things.
Raven (GSD) - December 8, 2007
Kaiser (GSD) - November 2009
Holly (GSD) - March 24, 2011
Best Paw Forward