San Francisco suburbs...ca. 1810
Archaeologists have discovered the foundations of an adobe structure in the Presidio according to this SF Chronicle story. This discovery is quite significant because it represents "the first venturing out of nonnative civilians from an established military post, said Stanford Professor Barbara Voss, director of the project."
"It's the first urbanization of San Francisco," she said. "It wasn't just a military or religious community but a secular, civilian community."
The structure, which is believed to have been built around 1810, and its surroundings offer a rare glimpse into local civilian life before the village of Yerba Buena was founded in the 1830s on the northeastern tip of the San Francisco Peninsula.
...The Presidio was established in 1776 by the Spanish and then fell under Mexican control in 1821 after Mexico gained its independence from Spain. The U. S. Army took over in 1848, evicting the existing Mexican families at the Presidio.