What my dream office is is a standalone building, light industrial style, in Mountain View, Palo Alto, or Menlo Park, with gated parking, and ideally a mile or less from public transit. Onsite generator, fiber, etc., and a way to split the building into public event space for 100 or so people, and offices, with private offices for everyone, with courtyard-type spaces for the groups of offices. 300-500 square feet per person in the "office" area.
The smaller buildings on Plymouth in MV, or Pioneer Way, or some of the office parks in Menlo, would all be fine.
I doubt most other startups want this -- they all want shared spaces with big open plan offices in nice buildings in downtown SF, it seems.