The typical asking rate per listing is in the $10's per square foot per year. The Arcadia region is going through a a boost in rates. In the last 3 months, the median rate rose $14 per sqft per year.
In the last 90 days, 2 listings have been posted online, which means spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,020 sqft. Most buildings in this area are around 1 floors. Most buildings in this market were built in 1983 and are Class B.