Most listings are in the $20's per square foot per year. The Concord submarket is going through a a boost in rates. In the last 3 months, the median rate increased $7 per sqft per year. That's a 40% increase in rent.
Compared to the rest of the Metrolina market, the Concord region has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 39 listings have been made available, 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 360 sqft. Most buildings in this market are close to 1 stories. Most buildings in this area were built in 1996 and are Class A.