From the official 2.38 Patch Notes - http://na.finalfantasyxiv.com/lodest...6869b10e012e57
- Purchasing Land
In order to purchase land, a character must first have attained level 50 in at least one class and also have earned the rank of second lieutenant in one of the Grand Companies. Each character meeting these requirements can purchase a single unowned plot via the placards found within the residential districts.
Plots of any size and within any ward may be purchased.
Interacting with a placard and selecting Purchase Land will bring up an option to buy the plot as either an individual or free company purchase.