If you happen to get to the point where you need more space for your city as you continue to build, then it's time to consider getting an expansion. Expansion is a very useful and efficient way to increase your income too and one should at least expand once if nessecary.
| # | Cash | Investments | Gold |
|---|---|---|---|
| 1 | $4,000,000 | $1,740,000 and 1 investment |
29 |
| 2 | $6,000,000 | $2,340,000 and 2 investments |
39 |
| 3 | $7,000,000 | $2,340,000 and 3 investments |
49 |
| 4 | $9,000,000 | $2,940,000 and 4 investments |
69 |
| 5 | $30,000,000 | $4,140,000 and 5 investments |
79 |
| 6 | $36,000,000 | $4,740,000 and 6 investments |
99 |
| 7 | $42,000,000 | $5,940,000 and 7 investments |
99 |
| 8 | $48,000,000 | $5,940,000 and 8 investments |
99 |
| 9 | $60,000,000 | $5,940,000 and 10 investments |
99 |
| 10 | $72,000,000 | $5,940,000 and 12 investments |
99 |
| 11 | $84,000,000 | $11,940,000 and 14 investments |
99 |
| 12 | $96,000,000 | $11,940,000 and 16 investments |
199 |
| 13 | $180,000,000 | $11,940,000 and 20 investments |
199 |
| 14 | $195,000,000 | $11,940,000 and 24 investments |
199 |
| 15 | $210,000,000 | $11,940,000 and 28 investments |
199 |
| 16 | $228,000,000 | $11,940,000 and 32 investments |
199 |
| 17 | $300,000,000 | $11,940,000 and 48 investments |
199 |
| 18 | $360,000,000 | $11,940,000 and 64 investments |
199 |
| 19 | $420,000,000 | $11,940,000 and 80 investments |
199 |
| 20 | $480,000,000 | $11,940,000 and 96 investments |
199 |
| 21 | $540,000,000 | $11,940,000 and 96 investments |
199 |
| 22 | $600,000,000 | $11,940,000 and 96 investments |
199 |
| 23 | $660,000,000 | $11,940,000 and 96 investments |
199 |
| 24 | $800,000,000 | $11,940,000 and 96 investments |
199 |