Most listings are in the $30's per square foot per year. The Thousand Oaks submarket is going through a decrease in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 2% decrease 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 made available, so you'll want to check back regularly for new listings. About 3% of the available leases 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 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 1,360 sqft. Most buildings in this region are around 2 floors. Most buildings in this market were built in 1986 and are Class B.