Most listings are in the $10's per square foot per year. The Black Hawk County submarket is going through a a rise in rates. In the last 3 months, the median rate went up $16 per sqft per year.
In the last 90 days, 48 listings have come on the market, so you'll want to check back regularly for new listings. About 92% of the listings in the Black Hawk County are subleases, so you might be able to snag a great spot on a short term. 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 1,770 sqft. Most properties in this market are around 1 floors. Most buildings in this region were built in 1976 and are Class A.