On average, listings lease in the $10's per square foot per year. The Carrollton submarket is seeing a decline in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 3% decrease in rent.
Compared to the rest of the DFW Metroplex market, the Carrollton region has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 21 listings have come on the market, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 5% of the office spaces in the Carrollton are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 1,450 sqft. Most properties in this area are around 2 floors. Most buildings in this region were built in 1986 and are Class B.