Nice Sans Font

Classification: 

Not sure what typeface this is... can anyone offer any help? I feel like that "S" is unique enough to lead to a solution.

Comments

The closer I can see is a [[http://www.typography.com/testDriver/index.php?productLineID=100035&styl...|Tungsten (Semibold)]] by Hoefler & Frere-Jones [2004], modified to make square the internal curvatures of /U & /S.