Any Ideas??

Taylor has learned that climbing stairs is SOOOO much fun. I constantly find him half way or all the way up the stairs many, many times a day. Does anyone have any ideas on how to block the stairs off? We can't put a gate at the bottom due to the opening on the side and we can't put a gate on the fourth stair (where Taylor is sitting) due to the hand rail. We won't be living in this condo past May probably, so major drilling or renovations can not be done. I am desperate for ANY ideas :) I am having trouble getting anything done in the basement because I can't leave him alone in the living room. This is a problem because the laundry and ironing is in the basement and more importantly my embroidery machine is down there!