Inherited Home with Nearly Zero Interest Rate: What's the Story?

Inherited mortgage with an almost negligible 0.188% rate from my deceased father dating to 2011; details remain vague. How was such a low rate secured, and does paying off early offer any benefits?

i think its a legacy govt-style deal older and rare. early payoff doesn’t do much coz you ain’t losing much interest, maybe your lender got some fees tho try ask em.