Now they’re asking $750. If the “brand new” ones are asking “only” $600k I think they’re still too much (and it’s never 600k – they’ll kill you on so-called “upgrades” like floors and counter tops).
If you don’t mind waiting in a traffic jam every weekday morning & evening to get on/off the 56, then Pacific Highlands Ranch is a good location.
But for that price you can find something elsewhere with better freeway access (although, not in Carmel Valley).
