This is only a price opinion just to give you an idea. For a solid value call an appraiser.
There is a listing right west from your lot and it's listed at $12,500 (Price improvement in July 2008) with the same square footage of your lot.
Your lot can list from $5,000 up to $10,000, it all depends how fast you want to sell.
The average day of lots on the market are 565 days, the price range from $4,900 - $250,000.
Let me know if this helps, (if it did, give me a little thumbs up by clicking the thumbs up button)
Jes Sierra, B.Sc.
Century 21 Beachside RealtorsÂ®
Chino Hills, California