Great shot.
810 feet to the top of the rebar on that picture (since the photo was taken on 9/23).
Transamerica is officially 853 feet (according to our skyscraperpage database).
I enlarged the picture, and it looks like the top of the rebar is about 15 feet higher than the TA (one SF floor).
So, this tells me that SF tower sits on ground approximately 28 feet higher than Transamerica?
If true, this will make SF tower seem even taller.