The typical asking rate per listing is in the $30's per square foot per year. The South Pasadena region is going through a a rise in rates. In the last 3 months, the median rate went up $39 per sqft per year.
Compared to the rest of the Metropolitan Los Angeles market, the South Pasadena submarket has greater rates, and you'll need to make a great offer to be in this hot region.
In the last 90 days, 3 listings have been posted online, which means leases most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 200% of the available leases in the South Pasadena are subleases, so you might be able to snag a great spot on a short term. 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 340 sqft. Most properties in this region are around 2 stories. Most buildings in this market were built in 1950 and are Class B.