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HOUSING: The San Geronimo Valley Affordable Housing Association is buying the mobile home park in Forest Knolls, ensuring that rents will remain reasonable for the 19 homes on the site.     David Briggs

In a win for affordable-housing advocates, the nonprofit San Geronimo Valley Affordable Housing Association on Tuesday formally agreed to purchase the historic Forest Knolls Trailer Court for $1,395,000 from Marin County, which had purchased the property from its original owners last October. The sale came with a pledge to maintain the trailers as affordable housing units in perpetuity, a move celebrated by concerned valley residents who have watched warily for years as new residents have…