Most listings are in the $0's per square foot per year. The Allen region is experiencing a decline in rates. In the last 3 months, the median rate fell $32 per sqft per year. That's a 100% decline in rent.
In the last 90 days, 19 listings have been listed, which means new listings might be going fast. You'll want to be prepared to make an offer immediately. 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 sqft. Most buildings in this area are approximately 2 stories. Most buildings in this market were built in 2005 and are Class A.