"verbal approval" does not hold water here or elsewhere. These are not the good old days anymore. Find out more about other kindergartens, compile a report and enjoy the slug-fest with concerned authorities. Your sponsors, if they are solid, should be able to guide and help you out.

From what I can think of, and most importantly, if the authorities can wrap their heads around it, it is the head-count that could also be taken into consideration by them and not just the size of the building. Not every kindergarten should be expected to accommodate 150 children. There are some that have just 15 children attending. Logically, one wouldn't need a 15 room mansion for it. But as many QLrs would say, logic does not see much light of day.

See if you can defend your plan based on your ability to scale down correspondingly to meet requirements. For future reference, get everything verified, signed and stamped on paper before you set out to do anything.