Most listings are in the $30's per square foot per year. The Santa Clarita region is experiencing a a rise in rates. In the last 3 months, the median rate increased $10 per sqft per year. That's a 36% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Santa Clarita submarket has more expensive rates, and you'll need to make a great offer to be in this hot region.
In the last 90 days, 101 listings have come on the market, so you'll want to check back regularly for new listings. About 8% of the available leases in the Santa Clarita 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 1,600 sqft. Most buildings in this region are around 2 floors. Most buildings in this area were built in 2001 and are Class A.