Most listings are in the $30's per square foot per year. The Simi Valley region is going through a a boost in rates. In the last 3 months, the median rate rose $17 per sqft per year. That's a 122% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Simi Valley region has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 7 listings have been listed, which means office spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
Even though the median size is 3,350 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this area are approximately 2 floors. Most buildings in this market were built in 1986 and are Class B.