Learn English: Boston's Towering Green Giant: Largest Energy-Smart Office Building Ever (normal)

Architects have created a super tall building in Boston called Winthrop Center.

But it's not just any skyscraper – it's the biggest office building in the world to have special features that save tons of energy.

These features, called 'Passive House,' help keep the building at a comfortable temperature without wasting much power.

It's like a giant, eco-friendly office!