The typical asking rate per listing is in the $20's per square foot per year. The Colleyville region is experiencing a decline in rates. In the last 3 months, the median rate decreased $4 per sqft per year. That's a 14% decline in rent.
Compared to the rest of the DFW Metroplex market, the Colleyville submarket has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 10 listings have been made available, which means new availabilities are probably leasing quickly. 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 1,540 sqft. Most buildings in this region are around 1 stories. Most buildings in this region were built in 2004 and are Class B.