Sorry, I should have provided a little more background. I am in the Denver Metro area. We have owned the property for 16 years. For the first 10 years we lived at the property, and the last 6 years we have been renting it. While I see other landlords doing most of their work without a permit, I have always checked to see if a permit was needed before starting a project.
During the last 6 years, I have obtained 2 permits for work on the property. The first was to remove and replace the roof. The second was to install a backflow preventer to then install an irrigation system 2 years ago. Both of these projects I completed myself and passed the inspection on the first visit from the inspector. This time around, I was denied a permit solely because I am a landlord.
There is a list of items that need permits, and a list of items that do not require permits. Items such as paint, flooring, landscaping, "minor repairs", etc do not require permits, so it appears that I will still be able to complete a considerable amount of work at the property. Thanks to everyone for the feedback. As you can understand, I was a bit shocked when this happened. It sounds like it is becoming more common.