On average, listings lease in the $20's per square foot per year. The Raleigh submarket is going through a a rise in rates. In the last 3 months, the median rate increased $27 per sqft per year.
Compared to the rest of the The Triangle market, the Raleigh region has less expensive rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 302 listings have come on the market, so you'll want to check back regularly for new listings. About 88% of the office spaces in the Raleigh are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 2,180 sqft. Most buildings in this area are close to 2 stories. Most buildings in this market were built in 1986 and are Class B.