Your publisher took this yesterday in San Francisco of the site where the 1,172 foot high SalesForce Tower is being built, which in 2017 will be the tallest building west of the Mississippi, and the new symbol of that city. Guess who's constructing it? DC-based Clark Construction. Who's guiding its development? DC-based Ray Ritchey, development chief for lead owner Boston Properties. And whose name is on the far side of the site if you squint? The tenant of an adjacent building: DC-based Neustar.