On average, listings lease in the $30's per square foot per year. The Altadena region is going through a decrease in rates. In the last 3 months, the median rate fell $2 per sqft per year. That's a 5% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Altadena submarket has less expensive rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 6 listings have been posted online, which means new listings most likley are going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 12,670 sqft, there are still 0 leases below 2,000 sqft. Most buildings in this area are approximately 1 stories. Most buildings in this area were built in 1946 and are Class A.