The typical asking rate per listing is in the $30's per square foot per year. The Simi Valley region is going through a an increase in rates. In the last 3 months, the median rate increased $3 per sqft per year. That's a 10% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Simi Valley region has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 11 listings have come on the market, which means office spaces are probably 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 2,710 sqft, there are still 0 office spaces below 2,000 sqft. Most properties in this area are around 2 stories. Most buildings in this region were built in 1986 and are Class B.