In the last 90 days, 5 listings have come on the market, which means new availabilities are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 80% of the available leases in the Belleville 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around sqft. Most buildings in this market are close to 2 stories. Most buildings in this region were built in 1975 and are Class B.