The further provisions of the Taxpayer Assistance Act of 2008 create a distinction between converting from primary to rental and vice versa under sec 121.

Slack works like a chat service but also separates from mobile phone network communication allowing a distinct bifurcation of business and personal communication.

Two very distinct population sizes I know, but they seem to have similar price points and good inventory, and their proximity to each other make it viable to double up on volume.  

Either one will have a very distinct odor that will be very conspicuous.

There is a distinct difference between a home and a investment property.

Its as easy to invest out of state than in state if you account for distinct factors.

I am on a rotational program at my company where they put us through 3 distinct one-year rotations, and we have literally no visibility into where they are going to place us until approximately one month before starting the new position.

And I think there is a distinction between "active" earned income for your work, and "passive" income generated by investments.

Obviously, that leaves a lot of room for interpretation/negotiation, but the distinction is important.If you squeeze an extra $1000 a year out of a 4plex, it will still appraise based on similar properties.

as @Jack Martin summed up and adding to what @Frank Rolfe said, the important key here is to not get caught up in POH vs TOH but to understand the math behind calculating them and understanding what Frank says when he makes the distinction between lot rent being income that can be capped (real property) as opposed to POH rental income that cannot be capped ( personal property).