In the 1980s, when ad agency Saatchi & Saatchi Compton Worldwide ditched “Mad Men”-era Madison Avenue in favor of moving downtown to 375 Hudson St., it was seeking what others have now discovered.

Speaking then to the New York Times, a Saatchi exec explained, “For creative people, the galleries, shops and restaurants there are a more exciting concept than being across from the General Motors Building.”

Back then, rents were $20 a foot. Now, as rents climb beyond $100 for certain floors in some buildings, the area, renamed Hudson Square, has attracted international behemoths like Google and Disney in various office projects.

They’re flocking to a neighborhood bounded by Canal Street to the south, Houston Street to the north, Sixth Avenue to the east and the Hudson River to the west.