Most listings are in the $30's per square foot per year. The Collin County submarket is going through a an increase in rates. In the last 3 months, the median rate rose $7 per sqft per year. That's a 27% rise in rent.
In the last 90 days, 244 listings have been made available, so you'll want to check back regularly for new listings. About 7% of the listings in the Collin County 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.
The standard measurement for office space in this area is around 2,490 sqft. Most properties in this market are around 2 floors. Most buildings in this market were built in 2001 and are Class A.