I had them in a couple of apartments when I was working in Cyprus and Denmark. 

Thanks @Jon Huber and @Kyle Denmark for the quick response.

@Shane Pearlman@Kyle Denmark @Jeff Greenberg First off, let me thank all three of you. 

I'm bicoastal the other way, raised in southeastern CT and now living mostly in Denmark.

Fear is such a prominent theme in our society... not normally the best advisor though...that said, I'd be interested to hear peoples thoughts about the impact of negative interest rates - It's a little early to see the impact of this on countries such as Japan, Denmark, Sweeden and Switzerland, but i could see this completely unprecedented move shaking up the global economy and creating some significant instability.

Germany and Denmark are also deemed a good place for real estate rentals.

My goal is to use all of this information to get started my self at some point in Denmark.

Does Denmark have any special rules I have to be aware of before moving forward?

I have been reading a ton of books, taken an excellent course on real estate investing at UNC Chapel Hill and been following the BP Podcast for some time.I expect to make my first investment in 2020 as I have managed to save up a bit of cash here while taking my masters degree in Business Analytics here in Barcelona, Spain.My plan has been to start investing after July 2020 as I expected to return to Denmark and thus be on ground making it easier to invest.

To quote Shakespeare, "Something smells rotten in the state of Denmark".