Business & farm

I have a  very similiar situation where there was 2 members partnership for rental property (which would be on Schedule E) only but in 2016 one member liquidated and his 50% of partnership basis was distributed to him on the K-1 but the K-1 was not marked Final.  Fast forward, the one single member continues  to file Form 1065 in 2017 and 2018 but he does not materially participate in real estate activities.  Can he continue to file Form 1065 as a single member LLC? Or is he subject to dissolving the partnership and filing Schedule E?  

 

Thank you

Grace