if my floor isn't big enough, I go to the elementary school after hours - usually within an hour after the kids go home. The custodians let me push two cafeteria tables together and when I'm done, I let myself out. They usually walk by every so often to check on me - a tin of home-made cookies, fudge or cupcakes is a real nice giftie to thank them for the time allowed. Been doing this for years!