You'll find that landlords play all kinds of tricks to ask top dollar for the property. 

Could you share how did you make your first successful case as a foreigner and what’s the tricks to commute with realtor?

No you can't buy a note from his single owner LLC or trick the system.There still are disclosures and max rates/fees...

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Do not be a one-trick pony- Develop multiple streams of income.

I mention this because a lot of loan officers try and use this trick to "Wash departing rents"If the home will not be rented and your loan officer is asking you to supply this and the underwriter finds outs the loan will be cancelled.Sometimes a customer or even the loan officer can confuse the guide lines or what was said by the processor.

Any other "trick" is just gravy and makes you money around the edges. 

Word of caution: The wholesaling tricks of cold calling/direct mailer for single-family might not necessarily work for large commercial multifamily owners, it might work for mom and pop operators (< 100 units).

A big trick i leveraged the heck out of was renovating older homes in such a way that they were appraised like a new construction home, it changes everything in valuation. 

It might hurt me getting deals, but I am not looking to trick people into selling their house to me.