Our company is also staying in the valley for a while...though we'll eventually need a presence back in Austin (where I moved from for WFP07), because about half of the largest companies we want to sell to are in Texas.
For $2600 you could rent 2.6 houses in the Seattle area... and seattle ain't exactly cheap. Or put another way, you get a nice 2BR house to live in with a yard, and you get a 3BR house to use as the office.... all for the rent of an apartment in SF?