Most listings are in the $20's per square foot per year. The Camden region is going through a a boost in rates. In the last 3 months, the median rate went up $6 per sqft per year. That's a 26% increase in rent.
In the last 90 days, 10 listings have been listed, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 70% of the available leases in the Camden are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 2,140 sqft. Most properties in this market are close to 21 floors. Most buildings in this market were built in 1927 and are Class A.