The 45-year-old San Geronimo Valley Affordable Housing Association is in the process of becoming a community land trust, paving the way for the mostly volunteer group to become a staff-led organization that can reach a broader base in the San Geronimo and Nicasio Valleys. Working in tandem with the Community Land Trust Association of West Marin and the Bolinas Community Land Trust, S.G.V.A.H.A. creates and manages permanently affordable housing for valley residents. The association oversees…