Most listings are in the $10's per square foot per year. The Nampa region is experiencing a decrease in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 13% decrease in rent.
In the last 90 days, 20 listings have been posted online, which means new listings are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 5% of the available leases in the Nampa are subleases, so you will probably have to focus your search on direct office leases. 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 1,150 sqft. Most properties in this market are close to 1 stories. Most buildings in this area were built in 2007 and are Class A.