I'm not 100% sure about each one's different benefits and cons, but which method would you recommend to use if you were in my position?

I would love to know whether it is possible to apply the BRRRRR method there or other creative financing over there as a foreigners.

@Henry Clark in step 1, what is the numerator of the ratio?

Search BP for ADU appraisals to encounter numerous examples.

I understand that BRRRR would provide more cash flow, but from what I've read this method also requires more time and investment.

. - which I suspect you're already inclined to do.You can also investigate various methods of pipe replacement / renewal that involve trenchless technologies, such as pipe lining, pipe bursting, or directional drilling.

This would be a VERY inefficient method and leaves me wanting to just send that list out to a different mailer service.What is everyone's thoughts?

I know very little about legal precedent but I'd expect the major meter manufactures (selling into the utility space) to be well incentived to challenge these items best they can, and they have money.Here are the issues, and the reasons that the difference between an air forced system and a boiler/hydronic system are not meaningful for this discussion (ie efficacy issues of sub metering exist for either when method of measurement is measuring heat at point of delivery):In either case, the blower (or pump for a boiler) is the method of 'moving' either air (central air) or water/glycol or equivalent (boiler etc). 

Pictures work wonders and numerous studies have shown that pro photography pays for itself many times over.4.

If you go to invest in the note space I strongly recommend you do a quick background check on the sponsor as there are numerous who have very questionable pasts.