For C/C- neighborhoods you usually need to scale to 10+ doors; it's a numbers game. 

Do you have a total price range you're looking for, or maybe a cost/door?

You can cold call, door knock, do social media ads, mailers, network, etc.

Specifically I could add a French door to a room to make it a bedroom.

I own 12-doors in the city of Detroit.I know exactly how well things are going there.

I had a very interesting interaction with my next door neighbor. 

This amounts to lost opportunity because if you had purchased RE, at the closing it can start producing return. 5) ADUs detract from the existing structure whether this is privacy, a garage, or just yard space. 6) this is related to number 1, but there are many more buyers looking to purchase homes for their family than there are RE investors looking to purchase small unit count properties.

You must give him this letter in writing, or certified mail, or tape the letter on his door.  2.

It's safer to at least have alarms in n doors if not the fencing.  

We go coast to coast with our 24000 doors.