The Great Fire and Earthquake of April 1906 destroyed
many records. Your probable best bet would be to look
up the teachers by name in the City Directories for
the years you are seeking. The school likely will be listed,
with the address. You can then see if it still exists and
write to see what they may have as far as old records go.

Some San Francisco City Directories are on line. I recently
saw the 1901.