The typical asking rate per listing is in the $20's per square foot per year. The Kenai Peninsula Borough region is going through a a rise in rates. In the last 3 months, the median rate went up $5 per sqft per year. That's a 22% increase in rent.
In the last 90 days, 10 listings have been made available, which means leases might be going fast. You'll want to be prepared to make an offer immediately. About 50% of the available leases in the Kenai Peninsula Borough are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 1,850 sqft. Most buildings in this region were built in 1993 and are Class A.