You may have to renovate a property, building maintenance fee may go up, rent will come down and vacancies will rise as the old properties become undesirable with time.

Looking forward to your insightsThere are probably many ways to go from $12 million annually to $60 million annually.  

I am in one that has exceeded 10% annual return for the past three years.  

Either way, I ran a proforma and this looks like a good deal (as long as you don't have too much in the way of rehab/maintenance costs).Also, IMO, you can probably raise rents even higher.

I recommend you do this annually to adjust for utility increases and other variables.

I purchased both as a package and for the next six years enjoyed great cash flow as I paid the tax on the house lot annually at about half of what it should have been and neglected to pay anything on the tennis court lot.  

-----------------------------------------------------------------------------------------------------------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 property in Class D area to Class A standards, what quality of tenant will you get?

For STR people we charge them 1.5 months rent and make them do all light maintenance 

If anything, when we plug in the details per the calculator we def have to put in higher then the estimiated 3% maintenance costs. 

And then maybe I wouldn't even worry about the annual fee after a lifetime charge, but to shut down my account without any explanation.