OK, that is much clearer now.
You have a rental property with an interest rate of 1.1%.
You get tax relief on the interest, to the net cost to you is about 0.6%
Do you have a mortgage on your family home? If so, that would be a much higher priority to repay as I assume that the mortgage rate is higher than 0.6%.
Have you maxed out your pension contributions? If not, that would be a much higher priority than repaying a loan which is costing you 0.6%.
I presume that if the bank gave you such a generous deal that you are not flush with cash.
The only reason you might pay off the warehouse in the meantime would be if you were planning to trade up your family home. The existence of a split mortgage would prevent you from getting a mortgage elsewhere.
I would not remotely worry about needing the cash to pay off a capital sum in 25 years' time. So much can happen in the meantime.
Brendan