They are going to need a lot more than 3 bathrooms
Last I checked, the sexuality-victims list was up to LGBTQIAA
But what about us transmogrified intersexuals?
Where are we supposed to pee?
In Toronto a few years ago, the "gay pride" festival wound up adopting the acronym "LGBTTIQQ2SA" (Lesbian, gay, bisexual, transsexual, transgender, intersex, queer, questioning, 2-spirited and allies) in order to be as "inclusive" as possible.
That list of possible genders is going to require a lot of extra bathroom space. I recommend repurposing the biology classrooms. They're obviously not using them.