He built a house on Camilla Street in the community that became Whittier, California. It is the oldest home in the city. "His next venture was in the grocery business, on San Fernando street, at the junction of Downey avenue."
This passage describes the early life and entrepreneurial endeavors of someone who built a home in Whittier, California, which is now considered the oldest house in the city. He then started a grocery store business in a particular spot on San Fernando Street, where it intersected with Downey Avenue.