For example, a crack of 1/8 inch in a 50 year old basement wall, near where the house meets an attached garage, would almost certainly not be bad - especially if you can see that the last couple coats of paint got inside it.

And does this work with garages/basements too?

The numbers look solid but I decided to get actual Landlord Insurance quotes to confirm my estimates and got a staggeringly high premium quotes from each and every insurance company I contacted (Liberty, American Modern, Allstate etc). 

We had it happen once & just got the city code enforcement guys involved to render the humble garage abode condemned for habitation.

Purchase price: $390,000Built in 1926, The Spanish Mansion is a sprawling 3600sqft 5bed/2.5bath Spanish style single family home with a 400 sqft garage.

I am planning to flip my garage into a studio.

FYI, rents are $1,100 for unit 1, and $1,300 for unit 2 plus 7 garages fully rented at $100 a piece. 

Convert a garage to an ADU.

Are there any laws that would prohibit one from sleeping in the garage and Airbnb our the whole house?

And tell her to stop buying material garage, respectfully.