The named contact is a major point at this price. Ask who answers enquiries, conducts viewings, negotiates and coordinates after acceptance—not just who attends the pitch. On conflicts, ask whether the agent or firm is also acting for the developer, another seller in the building, or a competing...
Neighbourhood boundaries could be distorting the comparison. I would keep City Deep warehouses separate from Linbro Park warehouses rather than treating every listing marketed as Johannesburg as one pool. Also split distribution facilities from older general-purpose storage buildings; otherwise...