In the last 90 days, 0 listings have come on the market, which means leases are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About NaN% of the listings in the North Riverside are subleases, so you will probably have to focus your search on direct office leases. 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 1 stories. Most buildings in this area were built in 1972 and are Class B.