The second option would be to line up a private lender and make a cash offer, on a short sale. 

I have been and am looking for private money partners and I know they exist and I know people doing that very successfully in this area.

Please feel free to comment or message me privately.

if my end buyer uses funds from a private or hard money lender will that interfere with me flipping the contract in anyway or potentially cause any problems?

Is there a way to ensure he does not have them financed to someone else, and also to ensure he actually isn't still paying on them to a private lender?  

It will be difficult to find private money based on your income so your best bet might be to take on a partner in order to do this deal.  

It has a common entrance with four one room with private bath on main floor and four one room with private bath upstairs.

Depending on the opportunities, we'll probably start with flipping and do buy-and-hold at a later stage, both in the Netherlands.In my private time I enjoy playing field hockey, sailing/boating and doing all kinds of technology projects (Arduino, electronics, etc) I love technology, how it makes our lives easier and I love to combine this love with real estate.

So please if you know any private money investors or where to network with them, let us know. 

I was thinking something similar recently Brendan... some public sector and even large private sector organizations are less and less a meritocracy...it can be hard to even know what the metrics are in some cases.