On average, listings lease in the $20's per square foot per year. The Castle Rock region is experiencing a decrease in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 11% decrease in rent.
Compared to the rest of the Denver Metro market, the Castle Rock submarket has less expensive rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 15 listings have been posted online, which means office spaces might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 7% of the available space in the Castle Rock are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 2,030 sqft. Most properties in this region are close to 2 stories. Most buildings in this area were built in 1993 and are Class B.