On average, listings lease in the $20's per square foot per year. The Bellflower region is experiencing a an increase in rates. In the last 3 months, the median rate increased $8 per sqft per year. That's a 50% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Bellflower region has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 4 listings have been posted online, which means listings are probably 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 500 sqft. Most buildings in this market are close to 3 stories. Most buildings in this region were built in 1955.