The typical asking rate per listing is in the $20's per square foot per year. The Windsor submarket is going through a an increase in rates. In the last 3 months, the median rate increased $23 per sqft per year.
Compared to the rest of the Bay Area market, the Windsor region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 3 listings have been made available, which means spaces might be going fast. You'll want to be prepared to tour spaces as quick as possible. About 167% of the available space in the Windsor are subleases, so you might be able to sign a shorter term by taking over a previous lease. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 760 sqft. Most buildings in this region are approximately 2 floors. Most buildings in this region were built in 2002 and are Class B.