The worst will happen if market actually collapses and prices going down a mere 20%.  

The Mortgage Amortization Calculation.It's really relevant.Consider that, as in my case, the Mortgages will be in the Millions.If you were to get a 30 year fixed rate $1 Million Mortgage and your Investment Property breaks even on Cash flow, meaning that the rents pay all the expenses as well as the Mortgage Payment, then your $1 Million Mortgage disappears in 30 years.If we do a simple calculation, take $1 Million divide it by 30 years, you get $33,333 per YEAR and $2,777 per month.If you don't see the value in this calculation, I think this has been a very missed opportunity merely because it's not emphasized in any of these books.

Now the bad everyone of the homes i went in needed extensive repaires and the mere thought of moving out an older generation didn’t sit well, plus the opioid problem but most of the tenants are in manufacturing factories.

Regarding the thread title, I would state that the rates are not “skyrocketing” but merely being adjusted upwards and still well below the national historic average.

How do I know if it requires a permit of is merely cosmetic?

I'm doing it, I just take offense to the comments suggesting that merely by asking, I'm some sort of slumlord.

Any of these follow up questions can shed some light on someones financial profile, but it isnt tacky or insulting to ask it...its merely casual conversation.

I am merely pointing out that fear is often not based in reality.

The temptation to take that extra cash and get one more door, especially when things are good, is simply to great for most mere mortals. 

So this is merely my first step!