The shower is not even 5% of the home's function.

Future tenants would likely appreciate the extra storage, and it could make your duplex more attractive in the long run without the hefty upfront investment that a full conversion would require.Another idea is to repurpose the shed into a functional office space or a private workout area.

I’d get 2 professional quotes in writing (pay for them if needed.Use those figures to come to an agreement.

@John Minnix, that is why I decided to write about it.

If they don't you should have an attorney send a demand letter (these usually aren't too expensive, especially if you write the draft and then the attorney edits it to make sure its in compliance and something they are willing to send, as some let you do). 

Podio is great if you end up having to build out a lot of custom functions. 

I had a lawyer write up an agreement.

Since it's easy and advantageous to write off in the same year, It is easy for me to be consistent in that manner, but I don't think we have that choice, we have to follow what IRS allowing.

thanks Zachary, I read where in order for me to write off the investment expense that I would have to be putting in 15 hours per week since as an investor since I'm full time W2 with a different employer. 

Paid $800 for a structural engineer to write up a 10 page piece of fluff telling us all the ways we could spend money to fix the sinking but settled foundation.