I have a DNN Site that I've been letting sit for some time. It's primary purpose is to list, sell, find homes for sale or rent. It has a small user base, but regular (although relatively small) traffic. It uses Ventrian Property Agent module as the primary engine for managing and searching the house objects.
When I created the site, I was very "new", and still am, but recognize that there was a lot of potential that I had not taken advantage. I would hope to not just modernize the site, but maximize the user experience, increase traffic, and utilize standard best practices throughout that I may not have originally used.
In addition, utilizing DNN and the Ventrian module are not "requirements". However, a modern and robust CMS would be a requirement. I have seen WordPress grow in popularity and functionality, and would at least inquire if this would be a recommended path. However, as an expert, I will look to you to make a recommendation based on your experience.
I'd like to add the website for more clarity on the project:
For future proposals, I would hope to see a unique and innovative design mock up attached or linked.