I'm pondering the idea of very small, local councils taking up at least part of city governance. My city is already divided into boroughs of average 10 000 people. There seem to be little point in drawing further electoral districts within the borough, since they would literally consist of single buildings. At the same time, the main issues decided in such councils would be largely related to where people live (small infrastructure, garbage management etc.), not who they are (in terms of political or ethnic identity).
Which voting system would ensure geographic representation, while possibly remaining simple to understand and requiring no further electoral districts?