source https://www.cnn.com/style/article/history-of-the-skyscraper/index.html
A short history of the world's tallest buildings
When New York's Equitable Life Building opened in 1870, the businessman behind the project, Henry Baldwin Hyde, was berated for having delusions of grandeur. Costing more than $4 million (around $81 million in today's money), his insurance company's headquarters soared a then-astonishing seven stories above the streets of Manhattan.
source https://www.cnn.com/style/article/history-of-the-skyscraper/index.html
source https://www.cnn.com/style/article/history-of-the-skyscraper/index.html