Most listings are in the $20's per square foot per year. The Westchester region is seeing a decrease in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 14% decrease in rent.
Compared to the rest of the Chicagoland market, the Westchester region has less expensive rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 55 listings have been listed, so you'll want to check back regularly for new listings. About 5% of the available leases in the Westchester 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 2,410 sqft. Most properties in this area are close to 2 floors. Most buildings in this area were built in 1986 and are Class A.