Built around 1830, Casa de Anza is a well-preserved example of residential construction from the period of Mexican California.

[2][3] The house was probably built about 1835, during the period when California was part of Mexico, and after the Mission San Juan Bautista was secularized.

It is a single-story adobe structure, built out of vertically placed wooden poles and mud bricks, with exterior and interior finishes of lime plaster.

It is covered by a low-pitch gabled roof with redwood shingles, which extends across an open veranda extending the width of the building, supported by simple square wooden posts.

A wood-frame addition extends across the full width of the rear, covered by a shed roof.