Most listings are in the $10's per square foot per year. The Castaic region is seeing a decrease in rates. In the last 3 months, the median rate decreased $4 per sqft per year. That's a 17% decrease in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Castaic region has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 3 listings have been made available, which means new listings are probably going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 4,950 sqft, there are still 0 new listings below 2,000 sqft. Most buildings in this market were built in 2008 and are Class A.