Second Life, L$ 475
Avalaible at SL Marketplace: My Little School

This little school has a scripted door, and scripted lights. Read the documentation for directions on its use, as well as things to be careful about if you plan on modifying it.

If you are going to modify the school, remember to keep always an ORIGINAL in your inventory!
This build is copy. Modify as you will, keeping an original, in case you make a mistake: You will always have the original to rez a fresh copy and start again.

You will see that, in inventory, the school build shows as copy/no modify/no transfer. But if you rez the school, you will see that the prims are copy/modify/no transfer. The reason why you see something different in your inventory, is because of the scripts and sound samples contained, which are all copy/no modify/no transfer. This does not affect at all your ability to modify the prims: resize, tint, add more scripts, rename them (inworld)... It's just how permissions work in SL.