A $27,500 grant from the county’s Measure W fund will help West Marin’s four affordable housing organizations work out the details of forming a new collaborative. On Tuesday, the Board of Supervisors approved funding for the Bolinas Community Land Trust to hire a consultant who will help it hash out an agreement with the Community Land Trust Association of West Marin, the San Geronimo Valley Affordable Housing Association and the Stinson Beach Affordable Housing Committee.…