The typical asking rate per listing is in the $20's per square foot per year. The Newport County submarket is going through a an increase in rates. In the last 3 months, the median rate increased $24 per sqft per year.
In the last 90 days, 88 listings have been listed, so you'll want to check back regularly for new listings. About 23% of the available leases in the Newport 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 780 sqft. Most properties in this market are approximately 2 stories. Most buildings in this area were built in 1870 and are Class B.