Commercial Space For Rent

I want to advertise as cheap as possible to rent office space in downtown Chicago suburb, in addition to Craigslist and an agent is there other ways to reach large numbers of potential tenants?

try www.loopnet.com

# Banners - Brand your company to send traffic to your website with these large geo-targeted, interactive advertisements.
# Newsblaster Ads - Reach over 50,000 brokers, investors and real estate professionals by advertising on our regional weekly e-shots.
Explosions # E-mail - the e-mail blasts to target specific ads are full page dedicated to your company and / or property.