On average, listings lease in the $20's per square foot per year. The North Richland Hills region is going through a an increase in rates. In the last 3 months, the median rate increased $20 per sqft per year.
Compared to the rest of the DFW Metroplex market, the North Richland Hills submarket has less expensive rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 16 listings have been listed, which means spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 100% of the available leases in the North Richland Hills are subleases, so you might be able to find a shorter term or below market rent. 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 1,250 sqft. Most properties in this region are around 1 floors. Most buildings in this region were built in 1986 and are Class B.