Adjustment and termination in special cases

(1) Where the circumstances that were material for determining the content of the contract have, since its conclusion, changed so materially that adherence to the original contractual arrangement cannot reasonably be expected of a party, that party may demand an adjustment of the content of the contract to the changed circumstances or, where an adjustment is not possible or cannot reasonably be expected of a party, may terminate the contract. The authority may also terminate the contract in order to prevent or remove serious disadvantages to the common good.
(2) The termination requires written form, unless another form is prescribed by legal provision. It should be reasoned.