However, our tenant turned out to be problematic—late payments, issues that led to an eviction, and additional repair costs before we could relist the property for sale.Now, after months of making mortgage payments out of pocket, we finally have an offer.

Local credit union.

I had belatedly realized that FHA goes off personal credit and therefore I couldn't use the LLC for it.

I used a personal line of credit of $8k to invest.

They also tell you that if you need additional onboarding that they are happy to set up additional classes. 

1) Renting garage units2) Additional Pet Fees3) Adding flooring insulation in the upper unit led to improved efficiency and sound reduction for lower tenants.

Additionally, I have one savings account for reserves for all my properties, which I add to every month. 

In neighborhoods that won't attract high credit score tenants, I've found that a stable job history with a MINIMUM of 1 year at current or previous job to be the best indicator of a great tenant. 

As for valuation, I see no reasons why a Junior ADU would negatively impact additional housing unit.

Got an equity line of credit and borrowed from it to pay cash for the property.