That's a good point, actually. In Florida, the restrooms are included in the first of the 4-5 cottages just past Hog's Head. If you take a look back at those aerial photos of our park, it seems there are only 2-3 cottages. Since our Ollivanders experience will presumably be the improved version found in Japan, it should take up most of the room just beyond our Hog's Head.
Basically, it's pretty likely that the new structures are just relocated restrooms. Oh, well.