If so, how do you trust you're getting a quality tenant that is safe?

You want not only qualified tenants (credit score, income, background checks, etc.) but quality tenants.

One of the biggest challenges of investing in Rustbelt cities is knowing where to invest and properly understanding the cooresponding pros & cons.Here's copy & paste advice we share to help to address this challenge:-------------------------------------------------------------------------------------------Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a Class A property in Class D area, what quality of tenant will you get?

With $4+ million in equity, you could conservatively leverage your replacement property(ies) and generate strong passive cash flow from high quality NNN assets.

Are their listings detailed with good-quality photos?

More freedom to tailor your investment to the guests' needs.More privacy for the guestsSecurity and keys can automatedMore rooms for more quality pictures!

It would actually be much easier to code in many other programming languages.From my worksheet where I calculated the interest paid each time the HELOC is paid to zero before putting a "chunk" toward the 1st mortgage:(outstanding balance) x (APR / 12) = this month's interest paymentAnother way to express that (for credit cards, for example) might be:(average daily balance) x (daily periodic rate x number of days in billing period)NOW do you see / understand the difference?

However with a long hold I do expect San Diego RE to have outstanding ROI.  

@Glenn McCrorey Outstanding!

Outstanding!