The Marin Agricultural Land Trust closed on a $1.5 million agricultural easement on the Gallagher Ranch, which borders Black Mountain and federal parkland and includes pastureland and forest traversed by Lagunitas Creek. The five co-owners of the 330-acre ranch, which has been in the family since the 1800s, put the property on the market in years past because some of the cousins did not want to keep investing in the upkeep. They had interest from…