The typical asking rate per listing is in the $20's per square foot per year. The McKinney submarket is going through a decrease in rates. In the last 3 months, the median rate decreased $7 per sqft per year. That's a 22% decline in rent.
Compared to the rest of the DFW Metroplex market, the McKinney region has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 47 listings have been listed, so you'll want to check back regularly for new listings. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,020 sqft. Most properties in this area are close to 2 stories. Most buildings in this market were built in 2006 and are Class A.