Already, the renovation has lured upscale, energy-conscious companies like Swedish construction firm Skanska, said Ray Quartararo with Jones Lang Lasalle, which is managing the renovation.

Skanska wanted its U.S. headquarters to have a LEED "platinum" certification — reserved for only the most efficient of buildings — and it found a willing partner in the Empire State Building. Skanska officials said the building's management helped them install bike racks and add other energy-saving details on the 32nd floor.

"We had looked at several downtown spaces, but the Empire State Building made the most sense," a company spokeswoman said.

Jacques Catafago, an attorney who works 16 floors above Skanska's new office, is also happy with the changes. Catafago has fought the building management before on other fees, but he said he wouldn't mind paying more rent if it goes toward renovations that cut his electric bill.

Besides, Catafago said, he's already checked out the rent for similar buildings in the city and realizes he has a pretty good deal at the Empire State Building.

"We'd be paying twice as much" uptown, he said.