To my mind property management is a serious issue. If a building is owned by too many small investors I cannot think of any good decision making process to be perform.

Of course it's serious, that is why each building has a management company which deals with all major issues. This is the way all real estate works currently with a single or multiple owners. With Atlant this system will be enhanced because each penny spent by the management company will be ok the blockchain, and large costs will be voted on by the ATL tokenholders.
It seems like a fair compromise. But then it makes the platform not 100% decentralized right?