It's an LLC, but I don't know why that should make a difference. Quite a few individuals hold their single family homes in LLCs.

One working hypothesis for why some people get this might be that their algorithm shows that you are overtaxed and this is a way to preempt your appealing if you don't submit the info, as apparently many fail to do. Most of the articles I found online regarding this issue were about people who failed to submit within the specified 45 days.