Most listings are in the $10's per square foot per year. The Ada County region is seeing a decline in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 12% decrease in rent.
In the last 90 days, 290 listings have come on the market, so you'll want to check back regularly for new listings. About 107% of the available leases in the Ada County 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 2,370 sqft. Most buildings in this market are around 1 floors. Most buildings in this region were built in 1999 and are Class A.