California Code, Civil Code - CIV § 5610

(a) An extraordinary expense required by an order of a court.

(b) An extraordinary expense necessary to operate, repair, or maintain the common interest development or any part of it for which the association is responsible where a threat to personal health or safety or another hazardous condition or circumstance on the property is discovered.

(c) An extraordinary expense necessary to repair or maintain the common interest development or any part of it for which the association is responsible that could not have been reasonably foreseen by the board in preparing and distributing the annual budget report under Section 5300.  However, before the imposition or collection of an assessment under this subdivision, the board shall pass a resolution containing written findings as to the necessity of the extraordinary expense involved and why the expense was not or could not have been reasonably foreseen in the budgeting process, and the resolution shall be distributed to the members with the notice of assessment.