I attribute our success in negotiating this to the time I spent building a one-on-one relationship with the seller.

When assessing a property for a HELOC the banks will not likely attribute full market value to the property and will only allow up to probably 80% of their assessed value as a HELOC.

The portion of the income that is attributed to the non-IRA (borrowed) capital is viewed as Unrelated Debt Financed Income (UDFI) and subject to taxation.I unfortunately do not have the time for a through explanation of the tax, but for most investors it is of nominal impact in terms of both dollars and percent of returns.   

If not, you would need to allocate the portion of the expenses attributable to your child's use.

I think you will see my profession shares some common attributes with yours.https://carlozgil.com/from-musician-to-investor/ If you are a musician or once were, reach out!

Another typical positive attribute about doing apartments is having less competition and having more units at a single address.The more units you purchase, the better. 

Look and talk until you are happy with the service they provide and have the attributes you want.

There have been no cases of popcorn lung ever attributed to vaping.

What are the major macro economic factors that attribute to your attraction to that submarket? 

The comps the appraiser was using did not have the same attributes my buyer/ tenant was looking for though.