A decision by trustees of a body corporate to prohibit an estate agency from operating within a sectional title scheme does not constitute administrative action under PAJA where: (1) the decision is managerial or commercial in nature rather than administrative; (2) it does not involve exercise of a public power or performance of a public function (no governmental control, regulation, or public interest); and (3) there is no empowering provision authorizing such a decision. However, such decisions are reviewable at common law where: (1) the affected party has been consensually permitted to operate and has developed a legitimate expectation of continuation; (2) the decision is procedurally unfair, unreasonable, irrational, or in breach of natural justice principles; (3) the affected party was not afforded a hearing before being prohibited; and (4) the decision is unjust in the circumstances. A person affected by such a decision has locus standi at common law and under s 38 of the Constitution to challenge it, even absent membership or contractual relationship with the decision-maker.