Most listings are in the $0's per square foot per year. The Long Beach region is going through a decline in rates. In the last 3 months, the median rate fell $17 per sqft per year. That's a 100% decrease in rent.
In the last 90 days, 1 listings have been made available, which means leases most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 sqft. Most buildings in this area were built in 2006 and are Class A.