On average, listings lease in the $10's per square foot per year. The Smithfield region is going through a an increase in rates. In the last 3 months, the median rate rose $18 per sqft per year.
Compared to the rest of the The Triangle market, the Smithfield region has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 9 listings have been posted online, which means new listings are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 190 sqft. Most buildings in this region are around 1 floors. Most buildings in this area were built in 1995 and are Class B.