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.

That land has more value, beyond market value, to them, since it is contiguous to their current properties and would allow for seamless expansion. ...Or, when celebrities purchase multiple properties around their personal residence, to house their employees or just have additional security and privacy. ...there are many more examples.

If it’s privacy it probably takes someone an hour to find out who you are instead of 5 minutes?

Other think stairs are great, but they are few in number.Single family homes have more privacy whereas townhomes and condos have shared walls, floors, or both.

But the ADU design needs to take these various scenarios into account and create enough separation/privacy between the 2 households living on the same lot.2.

The ones on the higher end have been updated more than my house, but with less space and privacy.2.

You might get privacy from the curious but lazy.

Outside is fair game for the obvious reason that nobody has expectation of privacy outdoors.

While I understand no locks on a private bath as access for emergency plumbing issues is required, I totally understand bedroom privacy in a roommate situation.

Might rent for more than roommate situation would give,  and would be better privacy.