Compared to the rest of the Denver Metro market, the Castle Rock region has more expensive rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 18 listings have been made available, which means leases most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 1,500 sqft. Most properties in this region are approximately 2 stories. Most buildings in this area were built in 1996 and are Class B.