Blend Issue: trying to blend the connection between two objects

 From:  FED
9229.1 
Hi
I am back again.
I have an issue blending two objects. I have tried hidden edges and keeping the objects without a face at the blend faces, but I am finding issues still.
I am new to MOI and trying to work out a workflow for budding architecture study models and components.
Any help would be appreciated.
Best,
FED
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