Built in the Monterey Style , this two-story adobe house has displays of period furnishing and handicrafts reminiscent of the early California rancho period. The construction of the Olivas Adobe began in 1847, led by a Chumash Indian named Juan de Jesus Tumamait for Raymundo Olivas. It was completed in 1849, but the Olivas home was not considered finished until it was blessed by a padre in 1851.
An adjacent building contains artifacts from the adobe and rancho eras in Ventura County. On request, an audiovisual program can be presented. The grounds include a small adobe and an adobe pit, beside rose and herb gardens.
The grounds are open daily while the house is open only on the weekends excluding holidays. Admission to the grounds and the house are free, and donations are gladly accepted.