I'm not sure what you're asking.
Are you wanting to know the average price for a 3,000sqft house? If so, based on recent sales it's about $273 per sqft. Home sales are a large range between $410K-1.28M for between 2700-3400sqft.
A 3,00 square foot lot with a house on it?
There aren't parcels of vacant land in Costa Mesa, you'd need to do a tear down of an existing home, if you're referring to a "residential lot".
Shoot me an email directly if you'd like to talk about this further, I don't look back on this same Trulia thread for answers posted after mine.
Emily S. Knell
Realtor Since 1996
Realty ONE Group