The Newsletter from the Nob Hill Neighborhood Association mentions a way to see the photos of houses with their historic preservation plaque that can be hard to type into a web browser. Here's another way to find the web site.
Get there from the NHNA web site LINKS page.
Click on LINKS near the top of the page, then scroll down the LINKS page to find the line that says
"See photos of houses with their historic preservation plaque" and click on that.
-- Spencer Nelson