The typical asking rate per listing is in the $30's per square foot per year. The Thousand Oaks region is going through a an increase in rates. In the last 3 months, the median rate went up $2 per sqft per year. That's a 5% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Thousand Oaks region has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 78 listings have been posted online, so you'll want to check back regularly for new listings. About 4% of the listings in the Thousand Oaks are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 1,720 sqft. Most buildings in this area are approximately 2 floors. Most buildings in this area were built in 1986 and are Class B.