| Level | Warden Office Lv. Required | Upgrade Cost (Cash) | Upgrade Time |
|---|---|---|---|
| 1 > 2 | 2 | 463 | 29s |
| 2 > 3 | 3 | 556 | 47s |
| 3 > 4 | 4 | 667 | 1m 22s |
| 4 > 5 | 5 | 3,000 | 5m 27s |
| 5 > 6 | 6 | 7,501 | 10m 21s |
| 6 > 7 | 7 | 15K | 19m 58s |
| 7 > 8 | 8 | 49.5K | 28m 27s |
| 8 > 9 | 9 | 59.4K | 39m 14s |
| 9 > 10 | 10 | 71.2K | 49m 2s |
| 10 > 11 | 11 | 85.5k | 58m 50s |
| 11 > 12 | 12 | 213.8k | 1h 5m 16s |
| 12 > 13 | 13 | 256.6k | 1:12:51 |
| 13 > 14 | 14 | 307.9k | 1:26:02 |
| 14 > 15 | 15 | 561.9k | 1h 40m 24s |
| 15 > 16 | 16 | 554.3k | 2h 33m 23s |
| 16 > 17 | 17 | 665.2k | 2h 43m 26s |
| 17 > 18 | 18 | 1.3m | 2h 51m 36s |
| 18 > 19 | 19 | 1.9m | 3h 59m 46s |
| 19 > 20 | 20 | ||
| 20 > 21 | 21 | ||
| 21 > 22 | 22 | 7.5M | 5h 59m 32s |
| 22 > 23 | 23 | 9.1M | 7h 33m 1s |
| 23 > 24 | 24 | ||
| 24 > 25 | 25 | ||
| 25 > 26 | 26 | 43.2M | 13h 14m 14s |
| 26 > 27 | 27 | ||
| 27 > 28 | 28 |