Most listings are in the $10's per square foot per year. The Idaho Falls submarket is going through a a boost in rates. In the last 3 months, the median rate increased $16 per sqft per year.
In the last 90 days, 74 listings have come on the market, so you'll want to check back regularly for new listings. About 20% of the available space in the Idaho Falls are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,130 sqft. Most properties in this region are close to 1 stories. Most buildings in this market were built in 1987 and are Class A.