Seems as though they've got scalability sorted out...

http://forum.square-enix.com/ffxiv/t...=1#post3853951

Apartments

An apartment block will be added to each ward and subdivision.

The current plan is to include 90 apartments available in each complex, but this number can be raised as needed for each ward, so don’t worry about room availability.

An apartment room can be purchased for 500,000 gil.

Everyone’s chocobo will be stored in the one stable stationed outside the apartment. You’re able to tend to another person’s chocobo as well. There is also a shared space in the lobby of each building that you can congregate in.