The typical asking rate per listing is in the $20's per square foot per year. The Westminster submarket is going through a a rise in rates. In the last 3 months, the median rate rose $8 per sqft per year. That's a 38% rise in rent.
Compared to the rest of the Denver Metro market, the Westminster submarket has lower rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 33 listings have been posted online, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 55% of the available leases in the Westminster are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 3,000 sqft, there are still 0 new listings below 2,000 sqft. Most buildings in this region are close to 2 floors. Most buildings in this area were built in 1998 and are Class B.