The typical asking rate per listing is in the $10's per square foot per year. The Ada County submarket is experiencing a a boost in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 3% rise in rent.
In the last 90 days, 375 listings have come on the market, so you'll want to check back regularly for new listings. About 1% of the available space in the Ada County 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,900 sqft. Most properties in this region are approximately 1 floors. Most buildings in this region were built in 1997 and are Class A.