How would you redesign this bathroom?

[Jacob D.]

I have a tiny bathroom with a plumbing stack running right through the center of the bathroom. It makes the space feel tiny, and there is additional unused space attached to the bathroom. I want to move the stack away from the center somehow, and redesign the bathroom to take advantage of the unused space. How would you redesign this bathroom?

The immediate issue is the sink is blocking the doorway partially. If I move the stack somewhere else, and move the sink to the unused space area it will make the bathroom feel much bigger than it is. 

The dimensions of the bathroom are roughly 6ft wide x ~5ft long. 

Attached is a diagram and will attach some pictures of the space. This is a 3 family with a large basement. The 1st + 2nd floors are the exact same layout, and have drop ceilings for better access to the plumbing. 

layout