Your Realtor can look through the title and tax records online and get you an answer almost immediately ... let me know if you need a couple of names in Memphis, I'm a member of the Women's Council of Realtors and we have several experienced members in your area. Good luck!
Welcome to San Francisco! Coming from Memphis you may experience a bit of sticker shock in terms of our prices. You're right that http://www.sfgov.gov portal doesn't post the tax rolls, you'd need to physically visit City Hall to look through the records, although there is other information that is useful. Feel free to email me the address at email@example.com and I can look it up for you.
I am not trying to look up Memphis info, I am trying to find San Fran prices online. I can't find a the tax assessors website for San Francisco to find online the property prices. I am relocating to san Fran and can't find anywhere to find what the current owner paid for a property.