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In page Rancho Petaluma Adobe:

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The Adobe was designed to function both as a headquarters of a working ranch and as a defensive structure against attack by the Russians then living on the California coast or by the borderland's native tribes. It consisted of two, two-story buildings surrounding an open courtyard of roughly 200 ft × 145 ft (61 m × 44 m). It was built using adobe bricks and hand-hewn redwood timbers and planks. The building had planked floors and a low-sloped shingled roof. The wide, covered second-story veranda encased and protected the adobe walls from the weather and provided advantageous firing positions in case of an attack. There were large gates located between the buildings on the south and north sides of the quadrangle.[1]