That belongs to the surface and typically it is the surface that gives an easement to the mineral rights holders for ingress/egress to extract the minerals. 

They (hopefully) do this for a living and no how to easily extract hot tubs.

Note cash flow is taxed, extracted appreciation is tax deferred. 

Are you wanting to extract equity back out of your newly purchased property?

Though it takes putting together a creative deal where you can create/extract value that most do not see.   

However if I do a BRRRR I can achieve infinite return by extracting all of my investment.

On the ones I've done, they do the 75% calculation as I outlined above and then include the net on my income.They will also ask for tax returns, so they can extract it from those if they want more detail.To apply the 50% rule, then, take the $930 rent and divide by 2.

You're basically stating I'll keep my investors whole on the 1.2mil by extracting from my personal account,  I'm not sure if you fully understand the law here.

They may select a contractor that charges $10/hr but they will charge $15/hr, extracting an additional $5/hr.Consider what kind of electronic services they provide.Can tenants pay rent online?

Therefore a refinance can only extract the ADU costs if the primary has appreciated enough to make this possible.