
I don't know where the idea of a tower came from. 11 stories is exactly what you'd expect for a building to match the other three corners there which is what has been planned for a decade or more. What's newish, but we already knew it was coming, was a slight enlargement of the floor plate after the developer bought the property next door (Club NV/Goat Hill Pizza). The surprise would be if they had found a tenant or decided to proceed with building it on spec, but I don't think anything here implies that.
A 500 ft tower at this site would be particularly problematic, even if anyone seriously contemplated it, because it would probably shadow the park-to-be on top of the TransBay Terminal. I can recall when the Planning Dept. expressed considerable satisfaction that the developer of Foundry Square chose not to propose any highrises on the site because of shadowing of the terminal.