Most listings are in the $20's per square foot per year. The Franklin Center region is going through a a rise in rates. In the last 3 months, the median rate rose $21 per sqft per year.
In the last 90 days, 27 listings have been made available, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 52% of the office spaces in the Franklin Center are subleases, so you might be able to find a shorter term or below market rent. 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 2,370 sqft. Most buildings in this region are approximately 2 floors. Most buildings in this area were built in 1983 and are Class B.