Hard money question

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Hi guys, 

I plan on investing solely in multi-families and large apartment complexes and would like to clarify something. Assuming I accept a hard money loan for a multifamily or apartment complex, what methods could I use to pay back the loan?

the BRRRR method isn't applicable here since I cant refinance commercial property with a conventional mortgage. Also, using my cash flow isn't effective. What methods have been successful for you?

Thank you