San Francisco does have a 'white ethnic' neighborhood: the
Russian neighborhood between maybe 20th and 27th Avenues in the Richmond District. It's mostly residential, but there are restaurants and shops, and the landmark
Holy Virgin Cathedral on Geary Boulevard, which Wikipedia states is the "largest of the six cathedrals of the Russian Orthodox Church outside Russia."
Most people from outside the region probably don't realize Russians have been living in what is now the Bay Area since 1812. They set up a nearby military fort,
Fort Ross, and their trappers completely wiped out the beaver population in the aptly-named Russian River. They traded those pelts for food and supplies with the Spanish, who first settled in San Francisco proper in 1776.
Holy Virgin Cathedral (Russian Orthodox), San Francisco:
Source: Wikipedia