Which preposition to use with retainable

in Occurrences 1%

Before this, as we learn from the Oesterreichischer Volkswirt (June 1916), Germany had issued other gold notes, in payment for gold from Turkey, which is retainable in Berlin till six months after the end of the war.

out Occurrences 1%

The usual guardian's commission is five per cent, retainable out of the funds of the estate.

Which preposition to use with  retainable