The typical asking rate per listing is in the $10's per square foot per year. The Lihue submarket is going through a decline in rates. In the last 3 months, the median rate decreased $11 per sqft per year. That's a 42% decline in rent.
In the last 90 days, 5 listings have been listed, which means leases 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 on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 960 sqft. Most buildings in this market were built in 1987 and are Class A.