Most listings are in the $20's per square foot per year. The Westminster submarket is seeing a a boost in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 3% rise in rent.
Compared to the rest of the Denver Metro market, the Westminster submarket has less expensive rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 50 listings have been made available, so you'll want to check back regularly for new listings. About 4% of the listings in the Westminster 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 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 2,200 sqft. Most properties in this region are around 2 floors. Most buildings in this area were built in 1998 and are Class B.