Last time I was looking, plenty of offices in Mountain View were on the order of $40 to $80. For the areas away from Caltrain, it got down to $30-40. This was 2012-2013, though, so it's entirely possible prices have gone up since then.

The real problem is everyone wants proximity to both 101 and Caltrain, which limits you to an exceptionally small area and small number of commercial buildings.

(I went in with some friends on warehouse space on Treasure Island last month, for about $12/ft with free 3ph power...finally going to have a decent hardware lab.)