building brings in 3.8 million visitors per year, sears tower 1.4 million visitors per year, the hancock objecttry in chicago 6 million per year. it's not about the dollars, it's the impact and coming from a tourism background, the experience that we can give visitors to san francisco and this will be, in my opinion, a very different perspective of san francisco in a spot and elevation literally that you wouldn't be able to get to without being in a helicopter or crane. and, so, i'd like to lean towards asking the project sponsor and the staff to continue working as this project moves forward to consider to really study an observation deck whether it's large or small. i totally understand the complications that it brings to the building adding another additional lobby for visitors versus office users, an additional elevator, expanding stairwells, i understand that problem that it creates. but i think it's potentially a once in a lifetime opportunity for san francisco to have a tower. we're probably not going to have many more of these if this may end up being the tallest building in san francisco