HELPING PEOPLE MAKE SOUND REAL ESTATE DECISIONS SINCE 2003. A.B.C.D. Real Estate Services, a full service real estate firm based in Chelmsford, MA, was formed in 2006 by John LaBelle offering Residential Appraisal and Brokerage services. While we have experience throughout Middlesex County, Essex County and Northern Worcester County, we specialize in the Merrimack Valley & Nashoba Valley areas, including: Andover,