The typical asking rate per listing is in the $10's per square foot per year. The Excelsior region is seeing a a rise in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 7% increase in rent.
In the last 90 days, 5 listings have been listed, which means listings are probably going fast. You'll want to be prepared to make an offer immediately. About 80% of the listings in the Excelsior are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 450 sqft. Most buildings in this region are approximately 2 stories. Most buildings in this market were built in 1985 and are Class A.