The typical asking rate per listing is in the $20's per square foot per year. The North Richland Hills submarket is going through a a rise in rates. In the last 3 months, the median rate increased $6 per sqft per year. That's a 31% rise in rent.
Compared to the rest of the DFW Metroplex market, the North Richland Hills region has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 15 listings have come on the market, which means new listings 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 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 1,500 sqft. Most buildings in this region are approximately 1 floors. Most buildings in this market were built in 1992 and are Class B.