The best place is in mayo building subway level. On the way to subway to plummer building. Go to subway welcome desk. Go down the hall from there. At the end of the short hallway on the right side. North side of cafeteria past the falcon camera. Ask at welcome desk if you need. Also down the subway from mayo to plummer past the regular restrooms. I send a lot of people there. Good luck. Most of the floors between gonda and mayo buildings also have special needs restroom.