|Assumed that you operate hotel business in Sumida ward, Tokyo, Japan.
You own 3 stories building and there are 4 rooms in each floor.
Each room does not equip with toilet.
In this case, you need to prepare at least 2 lavatories in each floor.
So, you will prepare 6 toilets in total.
On the other hand….
In this case, as far as there is a toilet in one floor (ex. 1st floor), it is sufficient.
You do not need to prepare a toilet in 2nd nor 3rd floor.