As of January 2012, the Residence limits are:
Rank | Size Limit | Residence Amount Limit | Free (non-donator) | 12x12x4 | 1 | Plus | 25x25x9 | 6 | Enhanced | 35x35x15 | 5 | SubGM | 45x45x20 | 7 | GM | 55x55x25 | 10 | SubAdmin | 64x64x35 | 14 | Admin | 90x90x50 | 20 |
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GM, SubAdmin, and Admin also can have a residence in the main city.
For more information on donation, please see this Donation Ranks Page on the Uberminecraft.com website