Mount Burdell grassland and trees in background. In the 1960s, the Sunset International Petroleum Company planned a new city of 4,000 homes called Greenborough on Mount Burdell. In 1977, the Open Space District (with the help San Marin’s Community Service Area No. 25) bought 1,439 acres on Mount Burdell from Exxon, the Nunes family and others. Mount Burdell is 1,558 in elevation. The Preserve is also 1,558 acres in size.
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