Looks like I’ll be purchasing a multiplex for ~560k.

I have a legal business in the U.S. that has been open 1.5 years and I'm wondering if anyone has any good recommendations for a personal or business loan that will give me the best rate for this purchase? 

I think that is something that needs to be taken into account when purchasing rental property.  

@Andrew Lopez, in MANY cases for the numbers on a BRRRR deal to work out the property needs to be very distressed and often not eligible for a traditional loan for the initial purchase.

Ensure that the purchase price, rehab costs, and After Repair Value (ARV) are all reasonable and accurately assessed.

Gain = Sales price less expenses less adjusted basisAdjusted basis is purchase price plus improvements less accumulated depreciation.

Analyze potential investment properties based on factors such as purchase price, renovation costs, potential lease revenues, vacancy rates, property taxes, insurance costs, and ROI .

The influencers "making millions from wholesaling" teach you the same steps everyone else teaches you. 

I actually have done personally exactly what you're describing - HELOC on primary residence, use that to purchase new primary, move into new primary and rent the previous home(4 times in 5 years).

Percentage of the purchase price), average home in Cleveland purchased in 2014 or the average home purchased in San Diego in 2014.