I do NNN everyday.Banks when they go dark you have a hard time re-purposing.

Happy to give you some more detail if you are interested, but this is a the classic area that people invest in from out of state and then lose their ***. 

The advantage in germany is, that if you get a classic bank-loan, you generaly only need to pay the closig costs; so leverage is better here.I bought my appartment really cheap. 1k per square meter.

Hey @Timothy Joseph,I haven't seen that one yet, but it's an instant classic!

Hello Fellows,Do you have any suggestion what can I do to repurpose an old 1960's hospital building into ?

As an investor and realtor in the local area, I can tell the classic answer to all of your questions, "It depends." -- Occupancy - Varies greatly. 

Trim - semi gloss painters white Bathrooms - Brook greenBedrooms - elephant skinLiving/Kitchen/Dining - classic silverSometimes I use Statuesque as a third gray color.

As I read your reply I’m realizing that I am your classic case of analysis paralysis.

What other options are there for renting out an unused basement, and how much money and work would it take to repurpose the basement for that use? 

Once you get your immediate questions resolved, you may also want to look at the larger landlord picture to get some ideas about the future people and property issues you'll  face.I did a short blog on some "classics" of landlord literature for newer landlords you may like.