Use a text editor such as notepad to edit the following files in the "c:\program files\cat daddy games\school tycoon\data\buildings" folder: "restrooms.ini", "academic.ini", "administration.ini", "athletic.ini", "entertainment.ini", and "food.ini". Locate the following lines (names will be different depending on the building).

Locked=1
LockType=prereq
LockValue=Jantitor,HalfPipe,Minigolf,LargeBathroom

Change their values to:

Locked=0
LockType=None
LockValue=None