Landmark Estates is being developed by Jim Petersen, Jr. of Petersen Built Homes. Jim has been in the construction industry for more than 20 years and was in the real estate industry prior to moving into construction. Petersen Built Homes develops properties primarily in Southern N.H. This is Petersen Built Homes third age-restricted community in Pelham. His first two communities, Paradise Estates and Long Pond Woods, are sold out.