Most listings are in the $20's per square foot per year. The Irving submarket is going through a an increase in rates. In the last 3 months, the median rate rose $26 per sqft per year.
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 submarket.
In the last 90 days, 352 listings have been listed, so you'll want to check back regularly for new listings. About 69% of the available space in the Irving are subleases, so you might be able to snag a great spot on a short term. 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 1,730 sqft. Most properties in this area are around 2 stories. Most buildings in this market were built in 1985 and are Class B.