Also, there may be some common area electrical / heating that you have to account for.Occupancy - Perpetually full is great and using 5% for vacancy gives you a bit of buffer / wiggle room for the unexpected.

I have a good job and a steady income but saving alone will take me years to have a decent amount to cover down payment, repair costs and unexpected vacancies.

Regarding what kind of cash-flow or ratios you need to retire and your concerns with future CapX, you should also plan ahead to have a reserve in the bank to handle the unexpected stuff.

Yellowstone is certainly not the least of these.Just because an event is rare does not mean it can't harm you or cause you unexpected expense.

Your investment with 10% down is $22k + $80k to rehab puts you into it $102k + there's always something unexpected. 

You now have credit for unexpected expenses that you may not have the cash for such as roof damage, hvac replacement, leaks etc. 

You need enough buffer in the deal to cover unexpected scenarios. 

If we take into consideration any unexpected situations the mortgage payment alone with property taxes insurance etc will be huge! 

@Mark RoadyThanks for the reply, I would be delighted if you could teach me.

I understand unexpected things happen but I'm preparing myself as much as I can.