Everything including bitcoin is measured in dollars.

I doubt as a society we will ever solve the affordable housing problem our country faces, but there are certainly measures that can be taken to make housing more affordable.

I thought  @Elliot B. was talking about installing meters on the supply and return pipes for each unit and measuring BTUs there.

That is why the acronym BRRRR is so popular and it has a track record of winning because inside that BRRRR is a metric that can be measured and replicated.

Make a Rolodex of them for later.2 - Complete your design plan - i.e. take measurements and come up with a plan. 

What we do for houses with heating oil , we measure the amount of oil in the tant ( There is a chart that tells yo how many inches equals gallons ) And the tenants pay that up front when they move in , the oil is now theirs .

You always invest for appreciation not solely, you always invest understanding it's a physical asset and requires different risk measures.

Have you noticed on BP thread after thread about assorted syndications suspending distributions, going belly up, taking measures to prevent going belly up? 

I really can't say what my average return was because over the decades I didn't keep track, it's not a relevant measurement.

A few things to consider if you want to go out of your market:1) What are your investing goals and the metrics you are measuring by?