My opinion is that nobody is ever going to buy that tiny sliver of land, perhaps I do wait it out or even let the future homeowner buy the lot at a steep discount because they can't sell it. 

Greenville is a tiny area and that is literally the last untouched/still C/D area that is surrounded by expensive neighborhoods on all sides besides bayonne, and NYC only 30mins.

In one of the units the kitchen sink would need to be moved back because it is really close to refrigerator and stove making the kitchen tiny.

My thoughts would be to make the third floor a master suite for the three bed unit and have combine two tiny bedrooms into one on the second floor, yielding a three bedroom total for that side.I thought about the floor joists as well.

My place is tiny--1440 square feet total, 720/side for a 2/1.  

For your area, consider temperature controlled storage as well.Depending on the population density of your area, you should also consider becoming a tiny U-Haul dealership.

I really want to expand existing the uncomfortably tiny full bath (35 sq feet) maybe adding a separate toilet closet.

I know they use is since they contacted me when a machine stopped working (tiny sock stuck in the water pump) but I have never seen the machines in use.  

We Changed back to our old company, they may charge a tiny amount more, but they will talk to our tenants and arrange times that is good for everyone.

They think the FHA inspection is nit picky and the seller is going to have to fix every tiny flaw, and that just is not true.