There's a planned community in north Calcutta called Salt Lake City.  Its very different from the rest of the city.  The Mahanirban Calcutta Research Group is located there... its a research org devoted to migration issues.  I have been using their library and so have walked around the area a bit.  Mostly quite posh, with lots of trees, really wide steets, clean buildings.  The picture is of a small garden I came across... the whole area is not this landscaped.

Of course there are slums on the outskirts, and the busy bazaars, dense traffic and overall grime that is more typical of Calcutta are really not so far away.