‘Cities hold two‐thirds of their residents in slums, and the rest in stiflingly limiting, inflexible structures.’ Thus the impoverished parochial Mumbai is one and the same metropolis as the cosmopolitan globalised ‘Bombay’. Ramesh Biswas examines how the speculative housing developments of the aspirational middle classes are creating townships that intensify sprawl and further decentralise cities, squandering the potential for upgrading public space and creating an architecture for the common good.