I think of it like this....
You rent a house from its owner. You move your family in, pay your rent, and everything is going fine.
Several years later the owner of the house suddenly decides to get some builders in and move some walls around, changing the sizes of the rooms.
Of course, the owner of the house has the right to alter his property as he sees fit. However, you and your family have been the ones to use and enjoy the house for several years.
Wouldn't you be a little bit annoyed? Just because you don't legally own the house doesn't mean you have no personal investment in it. And the owner is a douche if he doesn't recognise that fact.