Out of 252 closed homes in Lafayette during 2010, the price per square foot ranged from a low of $188, to a high of $711. There are numerous variables that affect it. Last quarter, the average price per square foot of closed sales was $400, which would reflect an updated property. For a 7 year trend graph of Lafayette price per square foot, by quarter, see page 36 of my free 2011 Lamorinda Real Estate Guidebook. Contact me if you would like a copy emailed to you, or if you would like my price estimate for a particular property.