What is the best method in Blender to model the area in the red circle below?  I have tried a number of methods (deleting faces, using <kbd>F</kbd> to join edges, etc) but am not completely happy with the results.  The meshes need to remain clean and relatively low-poly.  Any advice would be appreciated...

Thanks,  
Jeff

[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/SNR1f.jpg