On average, listings lease in the $10's per square foot per year. The Concord submarket is going through a decline in rates. In the last 3 months, the median rate decreased $4 per sqft per year. That's a 18% decrease in rent.
Compared to the rest of the Metrolina market, the Concord region has lower rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 39 listings have been made available, which means leases 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,760 sqft. Most buildings in this area are close to 1 floors. Most buildings in this market were built in 1998 and are Class A.