Most listings are in the $20's per square foot per year. The Irving region is seeing a an increase in rates. In the last 3 months, the median rate went up $0 per sqft per year. That's a 2% increase in rent.
Compared to the rest of the DFW Metroplex market, the Irving region has higher rates, and you'll need to make a great offer to be in this hot region.
In the last 90 days, 202 listings have come on the market, so you'll want to check back regularly for new listings. About 3% of the office spaces in the Irving are subleases, so you will probably have to focus your search on direct office leases. 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 850 sqft. Most buildings in this area are close to 2 floors. Most buildings in this market were built in 1985 and are Class B.