If you are able to add two bedrooms and a bathroom downstairs with some kind of internal staircase that can also be closed off to allow you to rent each floor separately, that will maximize your rental pool and your value.

They would be better poised to run a STR if it's in their same town.I have 23 STRs in this town, 83 beds, 37 bathrooms. 

Installed brand new soft-close cabinetry throughout, Quartz countertops, new can lights, new flooring, new doors, baseboard and trim, new lighting and plumbing fixtures and tile surrounds in the bathroom.

We're in Indiana BTW.Project: Adding 10x12x8 Master Bathroom to current 3 bed 1 bath 1600SqFt SFH. 

He was the original owner of a duplex (up/down), each unit being 2 bedrooms and 1 bathroom.

Use a carbide blade on an oscillating tool, rather than the purpose-made grout-removal blades they sell to mount on recipro saw.This is kind of why white as a bathroom grout color never goes out of style.

Gutted a falling apart bathroom and it became a walk in closet.

Its bad, and they clearly aren't cleaning the kitchen/bathroom, are leaving food out, etc.In our lease I have a rules addendum that says any bugs/issues due to conditions of tenant would be their responsibility to pay for.A few things I'm interested in doing, and gaining advice for:1. 

My tenants are moving out on one side and I'm planning on doing a quickie fix-up ( floors, paint bathroom ect.). 

The basement apartment is currently being rented for 750 however, its in poor condition in my opinion, bathroom needs work and a few wall/window cosmetics.