The typical asking rate per listing is in the $10's per square foot per year. The Richardson submarket is going through a decrease in rates. In the last 3 months, the median rate fell $5 per sqft per year. That's a 19% decrease in rent.
Compared to the rest of the DFW Metroplex market, the Richardson submarket has lower rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 86 listings have been listed, so you'll want to check back regularly for new listings. About 3% of the available space in the Richardson are subleases, so you will probably have to consider a longer term lease. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 2,550 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this area are approximately 2 floors. Most buildings in this area were built in 1985 and are Class B.