In the 30 days ending July 14, 2026, 114 homes closed on Manhattan's Upper West Side at a median price of $1.50 million. What would it take to build that price in 10 years?
At 0%, the answer is $12,500 a month. With a steady 4% annual return, it is $10,187 a month. At 6%, it is $9,154.
A $1.5 million target over 10 years
| Annual-return assumption | Required each month | Total contributed over 10 years | Simulated growth |
|---|---|---|---|
| 0% | $12,500 | $1,500,000 | $0 |
| 2% | $11,303 | $1,356,360 | about $143,770 |
| 4% | $10,187 | $1,222,440 | about $277,594 |
| 6% | $9,154 | $1,098,480 | about $401,672 |
At 4%, the monthly deposits add up to $1,222,440 over 120 months. The remaining roughly $277,594 comes from the modeled growth. Moving the return assumption from 4% to 6% lowers the required monthly contribution by $1,033.
Five more years changes the monthly target
At the same 4% annual return, extending the goal from 10 years to 15 years takes the required monthly amount from $10,187 to $6,096.
| Time to target | Required each month | Total contributed | Simulated growth |
|---|---|---|---|
| 5 years | $22,625 | $1,357,500 | about $142,514 |
| 10 years | $10,187 | $1,222,440 | about $277,594 |
| 15 years | $6,096 | $1,097,280 | about $402,888 |
A five-year deadline needs more than $22,000 every month. A 15-year deadline needs less than $6,100 because the earlier deposits have more time to compound.
How the monthly calculation works
The same contribution is added at the end of every month. The annual return is divided by 12 and applied to the balance already in the account, so the first contribution has the most time to grow and the last has almost none.