8. 30 Rockefeller Center $1.3 Billion

30 Rockefeller Center-Midtown-30 Rock-NYC

In 2013, Comcast purchased a 49% stake in NBCUniversal from General Electric. Part of the $16.7 billion deal included 1.3 million square feet inside 30 Rockefeller Center and other properties in New Jersey for a $1.4 billion price tag. As a reference, General Electric paid $440 million for this space in 1996. The building also contains the famed NBC Studios and the Top of the Rock.