Measures to strengthen social connections of people living in apartments is part of a new plan to improve social sustainability in the City of Sydney, which could include block parties and “community concierges”, and requiring more communal spaces in new developments. The city has 75 per cent of its population living in high-density apartments – expected to grow to 90 per cent – with 40 per cent living alone. A survey of residents found that less than half were satisfied with feeling part of the community, with 51 per cent of residents reporting they were neutral, unsatisfied or very unsatisfied. Only just over half thought they could get help from neighbours if needed. With increasing levels of density, the city says improving social cohesion is crucial to mitigating the challenges of high-density living, including issues relating to noise, parking and pets.