Compared to the rest of the The Triangle market, the Smithfield region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 9 listings have been posted online, which means listings most likley are 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 170 sqft. Most properties in this region are approximately 1 stories. Most buildings in this area were built in 1995 and are Class B.