[2] It was the first kiln-fired brick building built in Riverside County,[3] and is the oldest non-adobe structure in the Inland Empire.

[4] The Danish sea captain Cornelius Jensen settled in Agua Mansa around 1854 where he ran a store, and he married Californio Mercedes Alvarado soon thereafter.

[5] Their home, which served as the area's general store, post office, and stage stop, was built next to the town's chapel.

[9] In addition to apricot and orange orchards, growing wheat, and raising sheep on the Agua Mansa ranch, the Jensens had another 400 acres (160 ha) in Temecula.

While Riverside was a temperance city, the Jensen's Agua Mansa ranch, on the other side of the Santa Ana River, had a vineyard; 2,000 US gallons (7,600 L) of wine were produced and sold each year.