On average, listings lease in the $20's per square foot per year. The Irving region is going through a decline in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 3% decrease in rent.
Compared to the rest of the DFW Metroplex market, the Irving region has greater rates, and you'll need to make a great offer to be in this hot region.
In the last 90 days, 352 listings have been posted online, so you'll want to check back regularly for new listings. About 67% of the available leases in the Irving 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 1,100 sqft. Most buildings in this area are around 2 floors. Most buildings in this area were built in 1986 and are Class B.