Commercial Vs Residential Mortgages for Multi Family Properties Under 5 Units?

mortgages

How do you differentiate between residential and commercial mortgages. I am looking to buy a two-family (2 unit) building for investment purposes. I intend to place the deed in an LLC and rent out both apartments.

Since it is a residential property under 5 units, I am unsure whether it is qualifies as a commercial or residential mortgage.

Thanks for any input you can provide.

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