The typical asking rate per listing is in the $20's per square foot per year. The Alabama region is going through a a boost in rates. In the last 3 months, the median rate increased $4 per sqft per year. That's a 19% increase in rent.
In the last 90 days, 1001 listings have come on the market, so you'll want to check back regularly for new listings. About 1% of the available space in the Alabama are subleases, so you will probably have to focus your search on direct office leases. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,960 sqft. Most buildings in this region are around 2 floors. Most buildings in this area were built in 1986 and are Class B.