Have a very similar issue but i have to admit you lost me in your explanation.  My clients own 100% of a business in a strip mall, they own 51% of a partnership that owns the strip mall, passive investors own the other 49%.  Their operating business is about 60% of the revenue to the strip mall.  The mall tenants pay rent and taxes/insurance through CAM which i assume makes it triple net lease which would be excluded from trade/business safe harbor but it is a self-rental so is it then considered one for Sec 199A purposes?  Is the rental partnership income QBI for everyone, QBI just for my clients but not the passive investors, or is it not QBI at all?  appreciate any help you can lend,