On average, listings lease in the $20's per square foot per year. The Franklin Park submarket is going through a an increase in rates. In the last 3 months, the median rate rose $7 per sqft per year. That's a 29% increase in rent.
In the last 90 days, 7 listings have been made available, which means spaces might be going fast. You'll want to be prepared to make an offer immediately. About 14% of the available space in the Franklin Park 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 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 1,500 sqft. Most buildings in this region were built in 1999 and are Class A.