The first adobe house built in the Pleasanton Valley
From California Historical Landmarks:
Here, in 1883, James Concannon founded the Concannon Vineyard. The quality it achieved in sacramental and commercial wines helped establish Livermore Valley as one of America's select wine-growing districts. Grape cuttings from this vineyard were introduced to Mexico between 1889 and 1904 for the improvement of its commercial viticulture.