The typical asking rate per listing is in the $20's per square foot per year. The Irving region is seeing 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 submarket has more expensive rates, and you'll need to pay a premium to be in this hot submarket.
In the last 90 days, 356 listings have come on the market, so you'll want to check back regularly for new listings. About 3% of the listings in the Irving are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 650 sqft. Most buildings in this market are close to 2 floors. Most buildings in this region were built in 1985 and are Class B.