Most listings are in the $20's per square foot per year. The Parker region is experiencing a decline in rates. In the last 3 months, the median rate fell $4 per sqft per year. That's a 14% decline in rent.
Compared to the rest of the Denver Metro market, the Parker region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 10 listings have come on the market, which means leases might be leasing quickly. You'll want to be prepared to make an offer immediately. About 10% of the available space in the Parker are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 1,500 sqft. Most buildings in this region are close to 2 floors. Most buildings in this market were built in 2004 and are Class B.