 The Paramount Building and 120 Wall Street, for example, were constructed in the set-back style without towers, partially because the limited size of the sites would have made the towers relatively narrow and – when packed with the necessary elevators and service facilities – economically unviable.Many other skyscrapers built on larger or more expensive plots opted for the tallest towers possible, including the $24 million ($3.8 billion in 2010 terms) Bank of Manhattan Building at 40 Wall Street and the City Bank-Farmers Trust Company Building at 20 Exchange Place.New York continued its lead in tall skyscrapers throughout the period; in 1920 it had ten times the number of tall buildings than its nearest rival Chicago.