On average, listings lease in the $20's per square foot per year. The Westminster region is experiencing a a boost in rates. In the last 3 months, the median rate increased $24 per sqft per year.
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 depreciated region.
In the last 90 days, 33 listings have been posted online, which means office spaces are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 21% of the listings 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.
The standard measurement for office space in this area is around 1,400 sqft. Most properties in this region are approximately 2 floors. Most buildings in this region were built in 1990 and are Class B.