Belgravia

Example:Belgravia is the antithesis of a slum; it is a place where luxury and elegance define the surroundings.

Definition:n. a very poor, often overcrowded and dangerous area of a city, typically characterized by old and unsuitable buildings and inhabited by poorly paid and unskilled workers

Example:This area has been transformed from a rundown one to the glamorous district of Belgravia.

Definition:adj. in poor repair and disrepair, dilapidated