{"name":"Octagon House","city":"San Francisco, California","canonical_url":"https://gydeinfo.com/san-francisco/places/octagon-house/","markdown_url":"https://gydeinfo.com/san-francisco/places/octagon-house.md","updated_at":"2026-06-19T14:47:20.557005+00:00","facts":[{"claim":"The house was built by William C. 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