(1) A claim for performance is excluded to the extent that performance is impossible for the obligor or for any other person.
(2) The obligor may refuse performance to the extent that performance requires an expenditure of time and effort that, taking into account the subject matter of the obligation and the requirement of acting in good faith, is grossly disproportionate to the obligee’s interest in performance. In determining what efforts reasonably may be required of the obligor, it also is to be taken into account whether they are responsible for the impediment preventing performance.
(3) In addition, the obligor may refuse performance if they are to render the performance in person and, having weighed the impediment preventing performance by them against the obligee’s interest in performance, performance cannot reasonably be required of the obligor.
(4) The rights of the obligee are governed by sections 280, 283 to 285, 311a and 326.