After the Great Flood of 1862 destroyed much of the town of Agua Mansa , Jensen and his wife built a home on hundreds of acres on what was to become the Cornelius and Mercedes Jensen Ranch , a California Historical Landmark , located at the Jensen-Alvarado Ranch Historic Park and Museum . Their brick home , the oldest non-adobe structure in the Inland Empire , was Riverside County 's first kiln-fired brick building
Great Flood of 1862
Great Flood of 1862
Cornelius Jensen