Most listings are in the $20's per square foot per year. The Alabama submarket is going through a a boost in rates. In the last 3 months, the median rate went up $4 per sqft per year. That's a 19% rise in rent.
In the last 90 days, 1010 listings have been posted online, 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 need to consider the implications of signing a direct lease with the building. 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 1,990 sqft. Most buildings in this market are around 2 stories. Most buildings in this area were built in 1986 and are Class B.