Most listings are in the $10's per square foot per year. The Wasilla submarket is experiencing a decline in rates. In the last 3 months, the median rate fell $2 per sqft per year. That's a 9% decline in rent.
In the last 90 days, 4 listings have been posted online, which means new listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. 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 1,250 sqft. Most buildings in this market are approximately 2 floors.