Yes, except any being sued in the lawsuit by the strata corporation: s. 171 of the Strata Property Act.
A BC strata corporation may commence lawsuits. However, in order to do so validly, such a lawsuit must be approved by ¾ of the owners at an annual or general meeting. If the strata corporation is suing some of its owners, they are not eligible to vote in respect to such a lawsuit. There are two levels of trial court in British Columbia: Supreme (with unlimited monetary jurisdiction) and Provincial (with limited monetary jurisdiction). A strata corporation can pass a bylaw permitting it to sue in Provincial Court on the collection of fines without the ¾ vote of its owners.
A strata corporation does not need approval by its owners to defend lawsuits.
In our opinion, yes, because a counterclaim is in the nature of a notice of civil claim which is the commencement of a lawsuit.
It can but s. 173.1 of the Strata Property Act permits a strata corporation to retroactively fix an otherwise unauthorized lawsuit.