For the investors that are investing and buying apartment complexes in several different states with multiple properties how often do u go and visit your properties ,tAlk to your property management companies and things of this nature ?

First sunny day in April, take new pics of the front and back yard as the sod will look a lot more natural and greener then.

There's very few circumstances where a seller shouldn't be able to produce tax returns, and if they can't, then you'd better tell them to get their CPA to certify the financials they send you and put their name on the line if they weren't truthful.  

I think a lot of markets like you mentioned are going to be protected from the next correction due to multiple industries all producing jobs. 

That is kind of the nature of living downstairs in multifamily. 

Investors are seeking hidden value and potential and often underestimate the demands on time, effort and expense to produce the vision or desired result.

Cleaning fees generally produce a profit, but not enough that I would include them in my calculation or rely on them to determine return on investment.

I have a HELOC on one of  my rental properties ( 0 balance, so I have the full amount to use) Also, on the other 2 properties I can do a Cashout Refi or HELOC  that can produce aprox. 160k between the both. 

Appreciation is icing on the cake for all long-held real estate, but your STR should be producing returns for you right away. 

When rain (or moisture) come, they expand to cover the gaps that are there naturally from installation.