Where did all these buildings come from? Wealthy donors and government grants. What do all the bureaucrats do? They run all of these facilities, their maintenance staffs and kitchen staffs and counselling staffs.
This is the reason all these costs have gone up: nobody donates money to pay for bureaucrats. They donate the building and saddle the school with the maintenance bill. These are white elephants that do nothing for education. Schools like them though because they increase their marketability. Taken as a whole, these things are a huge liability for society because schools are in a zero sum game when it comes to competing for students.
The corporate bureaucracy was growing, but it didn’t have much to do with those student services or facilities because that was all separate.
This is not to say university bureaucracies are not bloated, but the bloat is multi-faceted and often grows in different directions for very different reasons.