Most listings are in the $10's per square foot per year. The Center Point region is going through a a boost in rates. In the last 3 months, the median rate rose $16 per sqft per year.
Compared to the rest of the Birmingham market, the Center Point region has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 2 listings have been listed, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 1,150 sqft.