Pena Adobe

The Pena Adobe stands a short distance southwest of Vacaville along the alignment of Interstate 80, on land that once formed part of the Mexican-era Rancho Los Putos. The rancho was granted in 1842 to Juan Felipe Pena and Manuel Vaca, two New Mexican settlers who had emigrated from Taos to the lower Sacramento Valley with their extended families and who established adjacent ranching operations on the new grant. The surviving Pena Adobe is the family headquarters of Juan Felipe Pena and is one of the principal pre-statehood structures of Solano County.

Architecturally the building is a vernacular Northern California rancho adobe with clear New Mexican antecedents in its construction technique. The walls were laid up from sun-dried adobe brick produced on site from local clay and set on a low stone foundation. The original exterior was finished with lime plaster, and the roof was framed in hand-hewn timber and finished with hand-split shakes; subsequent rebuildings introduced milled lumber and later roofing materials. The Historic American Buildings Survey documented the structure as HABS CAL,48-VACA,1 in the twentieth century, contributing measured drawings and photographs that record its original plan and elevations.

The Pena and Vaca families together gave their names to the towns of Vacaville and to the surrounding agricultural landscape, and the adobe stands as one of the principal documents of the New Mexican migration of the 1840s that contributed Hispanic settlers to the Sacramento Valley independent of the older Spanish-Californio coastal population. It was listed on the National Register of Historic Places in 1972 under reference 72000261.

The property is preserved within Pena Adobe Regional Park, owned by Solano County, with interpretive grounds and limited public access. Within the broader California adobe tradition, the Pena Adobe is among the few surviving structures that document the New Mexican strand of the state's nineteenth-century adobe building lineage, distinct from the coastal mission-Californio tradition and rooted in the upper Rio Grande building methods carried west to the Sacramento Valley.