On average, listings lease in the $20's per square foot per year. The Keller region is seeing a decline in rates. In the last 3 months, the median rate fell $8 per sqft per year. That's a 27% decline in rent.
Compared to the rest of the DFW Metroplex market, the Keller submarket has less expensive rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 8 listings have been made available, which means office spaces 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,550 sqft. Most buildings in this area are around 1 floors. Most buildings in this area were built in 2006 and are Class B.