Thx for the interest and open discussions on my original inquiry.
Some leads have been developed offline and are continuing to rollout.
If there are additional parties who can reply with additional leads, I would be interested in hearing from you.
Just for clarification:
High yield in my case refers to an avg. difference of 2% between yield and funding. Investments targeted between 10-20M Euro. Can be stretched either way.
Secure is a matter of definition. Should be relatively secure (long term lease etc.).