But I don't think any bank would go for that.... they always want both parties involved in the loan because then there's less default risk... you might get lucky though since 75,000 isn't that much, but I would ask about it first.
And the thing with the market interest rate is also really stupid.... how high is market rate supposed to be, anyway?
If I live in the house with my sweetheart for 20 years and he lent me 200K, am I allowed to suddenly pay him 50,000 in one go if we separate?