Most listings are in the $30's per square foot per year. The Lake Arrowhead submarket is going through a a rise in rates. In the last 3 months, the median rate increased $36 per sqft per year. That's a Inf% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Lake Arrowhead region has greater rates, and you'll need to make a great offer to be in this hot submarket.
In the last 90 days, 1 listings have been listed, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 100% of the available leases in the Lake Arrowhead are subleases, so you might be able to find a shorter term or below market rent. 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 2,420 sqft. Most buildings in this market were built in 1981 and are Class A.