Also price per square foot doesn't reflect lot size. Orinda will, I suspect, have larger lots than Rockridge.
If you wanted to buy a decrepit 600 sq. ft shack on a 10-acre lot in downtown Woodside, a price per square foot metric might seem like it should be <$1M. In reality the property would sell for $10M+ based on the land value, with the shack having negative value because of the cost to tear it down. (Ob. Steve Jobs Woodside reference here.)
