Out HQ is based there, so I am happy to connect and point you in the right direction. 

I understand a duplex may have an Accessory Dwelling Unit (ADU).The objective is to get a permit to change the windows, put up siding, and add a fence.  

Would love to set up a chat! 

Additionally, you might want to install a fence with a self-locking gate and make sure all pool equipment is up to code.

Either is up to you, just plan on when you'd want to raise it to balance other vacancies since it sounds like you'll have at least 1 with the non renewal

It's an older home, and it's currently set up as a rental, which I think is part of the reason it's not selling.

In the apartment industry, typically $250-300 per unit per month is held by the banks in escrow, but R&M can be much higher - Utilities - Is there any common-area lighting?  

Your resident based will be much more stable, turn costs will drop.DM me if you have any questions. 

I just finished listening to episode 838 and am now panicked because I don't have any of these other protections set up.  

If you are changing careers and your income will go down significantly (you said change, I implied decreasing), why not keep the money as a back up/emergency fund in case you need it?