Porch floor, painted foundation exterior, bathroom ceiling.

If they are solid, they pick up after themselves in common areas, keep the dishwasher running, and treat it like a home, making it *much* easier for me to keep it clean and ready for STR guests. 1-2 a month as needed I sweep/mop/catch up however needed, clean bathroom, etc.

The house I am looking to buy has a detached garage about ~1300 square feet and already has a bathroom in the property. 

The issue was electrical and a licensed electrician made the repair on a GFCI in a bathroom. 

We completed this project with (2) holes in the back yard and 2 holes inside the home (bathroom and laundry).

in May I closed a permit that removed load bearing wall, added a bathroom, and removed a fireplace.  

But if you are committed to purchase, a 2/2 would prevail over a 2/1, the price difference has to be nominal and now you might attract a different user like tow couples or adult friends that don't want to share a bathroom vs a young family that the kids are okay to use the same bathroom as the parents. 

Add a half bathroom to each unit that increases rent $100/month ($1200/year) and add $39,600 in value per unit.  10 units and you have added nearly $400k in value.  

Just now I see 2/1 in Castro valley where garage has been converted to living room , add bathroom here for 20k here and you pay 1k in mortgage with second tenant

It's 3 bedrooms and 1 bathroom.