Changing agent is the search that converts. It comes from a committee that has already decided something must change, and the firm that explains the process rather than advertising itself is the one contacted.
Service charge disputes bring individual owners who are one step away from organising a change. The page that explains what a charge can and cannot include earns a hearing from the whole building.
Developers and freeholders search differently and are worth more. Setting up management for a new scheme is a longer, larger relationship, and it is looked for with entirely different terms.
Building type is a real search: period conversions, new-build blocks with plant to maintain, mixed commercial and residential. Each has its own problems and its own vocabulary.