First Rental Investment (Triplex in Hawaii)

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Hello everyone, so I am looking at purchasing a triplex in Waipahu,HI (8 bedrooms, 4bath, 3,095 sq/ft living area/6000 sq/ft total). $38k down and financing $837k @3.99% (30 yr) w/ an potential annual cash flow of $21k. Assuming no rehab is needed, and based on these numbers alone, does this look like a positive investment as I am planning on holding for at least 20 years (Cash on cash return expected: 5,012.64%)? Thank you for your input!!!