I am studying finance and currently interning with a property management company in my college town.

Let's go with a very conservative $10,000 of profit on average per deal though, $3,000,000 in revenue, $680,000 in expenses, $2,320,000 in profit.

More important to consider would be the monthly revenue, regardless of occupancy.

Low ReturnsIt's very hard to discern because of the sheer amount of noise in markets (international trade development, explosive technological advancements, changing demographics, change in geopolitical circumstances, change in banking regulations), but the US economy has been fundamentally weakening over the last fifty years. 

I believe this would qualify as a commercial deal since you intend to rent out the buildings on the property; as you press forward you should prepare for reserves (6 months worth of rental revenue for the units)Calling a loan officer will get you the quickest & best answer

There is no conventional financing (that I know of) for a BRRRR STR and very limited (if any) conventional that will use future STR revenue as income. 

To do it well you need very specialized expertise in abstruse things like capital account accounting, internal controls risk, cross collateralization, contingent liabilities, deal carve-outs, and many systemic risk patterns that by definition are impossible for the sponsor to design out without paying to pass this risk to a party who would charge more than the risk indemnification would cost.  

As the formula shows (cap rate + appreciation rate) = internal rate of return <— this is a very simplistic example as there is a ton more information associated with this.That’s why it’s best to see what other market participants are doing and what they’re expections are.

I've rented to med students, bartenders, interns, corrections officers, IT guys, retail workers, pretty much the whole spectrum of occupations.

Indeed, when the US bank will not take into account the revenue from the Polish property to repay the loan.