mortgage lenders for investment properties? recommendations?

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I see hard money lenders category on BP but no list of mortgage companies that specialize or work well with investors. 

here is what I have purchase contract for/looking to finance: 68k purchase price on a fully occupied duplex, I can put 20%-25% down giving me a 51-54k amount to mortgage. This will keep me above the 50k minimum requirement to get a 30yr fixed mortgage. (im in it for cashflow, not principle paydown).

The bank I do commercial loans with is very small, doesnt do much with investment properties regarding mortgages.

I only have 1 other SFR mortgage.

Any "must check with" mortgage companies out there you recommend or have had a good experience with getting a 30yr fixed low interest loan on an investment property?