Most listings are in the $30's per square foot per year. The Brentwood submarket is experiencing a an increase in rates. In the last 3 months, the median rate rose $36 per sqft per year.
In the last 90 days, 7 listings have been listed, which means listings are probably going fast. You'll want to be prepared to make an offer immediately. About 386% of the listings in the Brentwood are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,200 sqft. Most properties in this area are approximately 3 stories. Most buildings in this area were built in 1994 and are Class A.