The demo work was done previously and it's been taken down to the studs.

I have come up with the following options so far:-install shower with glass block window with tile surround and bath vent fan (no idea as to how waterproof this may be)-demo old tub, wall off window, install prefab tub/shower combo and bath vent fan -reframe window to be much smaller and higher on the wall, leave existing tub, install tile surround and plumbing for shower-leave as is and hope tenants don't care about not having a showerIn most of these cases it seems to really just boil down to whether I want to have a window that can be opened to alleviate wet room moisture, or install a vent fan. 

Saturday afternoon and Sunday were spent demoing everything that is going to be replaced including both bathrooms (leaving 1 toilet and one sink, the entire kitchen, all the carpets, all the doors...

The eventual buyers were actually in the property right after demo and kept coming back.

I forget what year that was, but the Metropolitan and Palace Amusements were still standing, although ready for demo (probably 2008ish)

And of course, you will need to verify before demo with a licensed architect or structural engineer.

Included demo and buying and installing 2 pre-hung metal doors - one with a half window and one just plain white (included door, framing, bottom threshold, hinges, basic knobs and locks).

Demo of the property may drive the cost too high to be able to build something that can bring in enough rent. 

If you want to go low tech, I would say to break out a section of the concrete there and see if anything is under it.Rent a demo hammer and mack a decent sized hole. 

For example, my bathroom demo and rehab, I see the end result in my mind, but I get hung up in little things in the process like hindsight, analysis paralysis, and reluctance to install something in the wrong order only to see myself having to redo it later and ballooning my budget out of control.