Most listings are in the $20's per square foot per year. The Omaha region is going through a a rise in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 3% rise in rent.
Compared to the rest of the Omaha market, the Omaha region has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 181 listings have been made available, so you'll want to check back regularly for new listings. About 5% of the available space in the Omaha are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 1,540 sqft. Most properties in this area are approximately 2 stories. Most buildings in this area were built in 1984 and are Class B.