Tony likes his property portfolio and takes interior and exterior design very seriously, as we can see in the building of the first Stark tower. When it comes to rebuilding the towers in The Avengers, we can see plans afoot for a more permanent team than a one-off coming together to save the world.
The plans that we briefly see on Tony’s desk during his discussion with Pepper show that he was always planning for each Avenger to have their own floor in the towers. Computer files can be seen for each member of the group with a cutaway section of the building. Even Pointbreak gets his own space.