Purchase price: $230,000 Cash invested: $70,000Put 20% down on my first property, I lived there for a year while adding two bedrooms, 1 bath, and finished the basement by myself.

When I was evaluating this purchase there was a duplex across the street for sale (about $600k).

There are probably 10 experts here on BP that work different states with different rules and procedures, I think every one of them agree that you want to see every property you bid on in PERSON, not on google street view, not on sat view, not on some website. 

Mortgage on my current home (4 bed, 1.5 bath, on roughly an acre, in a quiet neighborhood) is $1445 and the idea would be to rent it out for $2000ish plus all utilities depending on the rental market this time next year but currently that's pretty close to where it would be. 

take Oakland and Oakland Schools  Piedmont Borders Oakland if you cross one street into Piedmont with Piedmont schools the values literally DOUBLE for the exact same house.  

How much money would it cost to add the half bath?

You might know of the vacant house down the street and be saavy enough to do the research and hunt down the owner and sweet talk yourself into a deal.   

Purchase price: $340,000 Cash invested: $7,000 Water front, 4 bed, 2 bath, detached 1 car garage, pier and dock.

Unit A - 2 bed 1 bath, recently updated. - Listing this unit now for $1100 with a $50 water fee. 

I think tiny homes are constrained by the dimensional requirements to be street legal without a state trooper escort.