What are dual key units and how do they work? A real estate agent was talking about them a few weeks ago. He was saying that some developers are building dual key units for those they are holding, in order to generate more cash flow. For example, rather than building a stock standard 3x2; they would convert the 3x2 into a 2x1 and 1x1, separated by a door. Both 'units' will have key entry. It'll require an additional small kitchen for the 1x1. Anyone come across these before? (Or developed them?) How does council approval work? And how do utility bills work?