A couple years back there was a ballot measure to try to remove Prop 13 for commercial properties, but it failed (but be wary of it coming up again). 

I use a version of the 50% rule as a quick but reliable measure of expenses on a single-family: you can reasonably expect all monthly expenses not related to the  principal+interest of the loan on a property OVER THE LONG HAUL to be 50% of monthly gross income.I also think she's just calculating that PITI expenses are pushing her down to - $120 a month.

I'm a relative newbie and went through this and found it helpful to first understand what each metric is designed to measure in the first place before deciding which one is needed for my analysis.

Early on we had two very similar houses 2 blocks from each other, one with a pool one without and we were able to see the pool house would rent roughly $100 per night and had a higher occupancy, so it was somewhat measurable. 

Quote from @Haley Jang: Hello BP team, a new house hacker here.I'd measure the property, identify furniture, research the market, and figure out what is the best rental strategy for you.

I need to outsource it.I post on CL and yelp etc for a very specific job that someone can give me a quick bidPictures, measurements and conditon of walls etc. 

In the Raleigh-Durham area 0.5% is the prevailing measure.

You may not be scaling as fast as other people because you are more comfortable with a measured approach. 

For example, at the very beginning, I liked Cash-on-cash return, CoCR, which is a great measure of return for rental properties.

If you’re local to the home, then there’s a device you can attach to before the meter and you can measure electrical usage.