The typical asking rate per listing is in the $20's per square foot per year. The Richardson region is seeing a a rise in rates. In the last 3 months, the median rate increased $20 per sqft per year.
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 undervalued region.
In the last 90 days, 99 listings have been posted online, so you'll want to check back regularly for new listings. About 102% of the listings in the Richardson are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 2,350 sqft. Most buildings in this market are close to 2 stories. Most buildings in this market were built in 1985 and are Class B.