Here is everything on the market in Lexington (24 land properties currently for sale):
http://www.territoryre.com/idx/search.html?search=true&s
For both zoning areas RO and RS (single family residential zoning) in Lexington, the minimum front setback requirement is 30 feet.
If I can be of any other help, just let me know. You can email directly at aimee.siers@commonmoves.com.
I will be online periodically throughout the day on this Memorial Day holiday.
Thanks.
Aimee Siers
Century 21 Commonwealth
29 Washington Street
Wellesley, MA 02481
508-981-7790
aimee.siers@commonmoves.com
