Compared to the rest of the Metropolitan Los Angeles market, the Big Bear Lake submarket has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 1 listings have been made available, which means spaces most likley are leasing quickly. 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.
The standard measurement for office space in this area is around 830 sqft. Most buildings in this area were built in 2007 and are Class A.