Most listings are in the $10's per square foot per year. The Parker region is going through a a boost in rates. In the last 3 months, the median rate went up $14 per sqft per year.
In the last 90 days, 1 listings have been posted online, which means new availabilities most likley are going fast. You'll want to be prepared to make an offer immediately. About 200% of the office spaces in the Parker are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,660 sqft. Most properties in this area are approximately 1 stories. Most buildings in this area were built in 1976 and are Class C.