But like I said pretty much everyone else I have interacted with in SC over the last 10 years..

Fast forward two decades to California and Oregon and outside of my growing RE business and portfolio, my day to day interactions with mortgage guidelines and underwriters were limited.

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I adjust this number to something I consider realistic and add anticipated capital expenditures and costs of replacing major systems divided by 15 or 20 years to arrive at an annualized expense.  

Again, the BiggerPockets store has some books for this or you can learn by watching podcasts, reading blogs, and interacting on the forum.

So even though I could qualify for new financing based on the anticipated rental income of this new house across the street, I don't have enough saved for the 25% downpayment anymore. 

Short of natural disaster and fire, there are very few surprises when it comes to the building, you can anticipate the expenses. 

Also, anticipate significant pension income stream—on top of our 30X portfolio--when we retire (in the next 10 years most likely).

[That's an extra $18K a month we didn't anticipate which really helps to offset those extra operating costs.]

We're working with several luxury STR purchase investors and several super jumbo refinances (over $3M) that are likely to commit with improved terms and anticipated ROI.