Essentially you are asking the seller to report on the actual rent collected and expenses for each of the previous 12 months on the building. 

If you buy a minimum of about 30 apartment units you can afford a Property Management Company and save your self the daily operations and maintenance which s typically what you want with a W-2 job. 

You can also write a form email, so you can essentially send the same response to all inquiries, saving some time and giving them all the required information and attention.

Open houses are typically great, low pressure ways to get inside houses if you are only trying to get comfortable looking at properties.

Essentially, if you can reasonably expect to make a similar repair within the useful life of the asset (not to exceed 10 years) you can deduct it. 

I usually never recommend refinancing so high because you typically have PMI and a higher interest rate.

You will typically find rates across the board.

Well, typically a financing contingency, if it doesn’t specify a max rate, usually references “market rate”.

The property manager said that she typically does not consult the Owner when leasing the property, and had never disclosed these new leases to the previous Owner or listing agent. 

Typically, a lease should state that there is "joint and several liability in the case of multiple Tenants."