Kolkata is located in the eastern part of India at 22°82' N 88°20' E. It has spread linearly along the banks of the river Hooghly.
The Kolkata Municipal Corporation has an area of 185 square kilometres. The city proper today can be roughly divided into two sections along Mother Teresa Sarani (Park Street). North of Park Street is the more congested part of the city. South of Park Street is the slightly better planned section of the city.
The old Calcutta Business District (CBD) is where the seat of the West Bengal Government is located, along with many other government offices. Several banks have their corporate (Allahabad Bank, United Bank of India, UCO Bank) or regional headquarters (Reserve Bank of India, State Bank of India, Bank of India, Central Bank of India amongst many others) around the Bagh area. Many of Kolkata's older business groups have their main offices here. The area is a mix of multi-storeyed office blocks and colonial buildings.
The newer CBD is around the south of Park Street, Camac Street and AJC Bose Road. Several high-rise office blocks including some of Kolkata's tallest commercial buildings - like the Chatterjee International Centre, Tata Centre, Everest House, Industry House, CGO Building - are located here.
In an effort to relieve congestion in the main city, many government offices have shifted to high-rise office buildings lining Bidhan Nagar's (Salt Lake) Central Park
The residential buildings are mainly lowrise and comprise of older colonial buildings and numerous new four storey apartment blocks. Ten to twelve storey apartment blocks have come up in large numbers in south Kolkata. The city has relaxed its rules on highrise construction recently and twenty storey buildings are becoming more common. The tallest residential towers of eastern India - the four thirty-five-storey towers of South City are under construction on Prince Anwar Shah Road.
Huge construction activity along the Eastern Metropolitan Bypass is changing the face of the city. Luxury hotels, a convention centre, speciality hospitals, condominium complexes, malls and multiplexes are coming up at a rapid pace.
The city's expansion in the eastern side is spearheaded by the construction of a huge new city called New Town adjacent to the well planned Bidhan Nagar. Located in Rajarhat, it is one of the largest planned urban developments in India.
The neglected western side of the urban agglomeration has got a boost recently with the signing of an agreement with an Indonesian company to build the West Kolkata International Township. Another huge new township is in the proposal state in Dankuni.