No property has a base price of $600. The most expensive base prices:
But with development, prices exceed $600:
| Property | Base | 1 House | 2 Houses | 3 Houses | 4 Houses | Hotel |
|---|---|---|---|---|---|---|
| Boardwalk | $400 | $600 | $1,400 | $2,700 | $4,000 | $4,000 |
| Park Place | $350 | $525 | $1,100 | $2,200 | $3,300 | $3,300 |
So: Boardwalk with 1 House = $600 rent. That's likely the reference.
To confirm: Which edition? Base rent or developed rent? The $600 = Boardwalk + 1 House in classic US edition.