A Washington, D.C., rooftop is being celebrated as what is thought to be the first in the city to be covered with vegetation, a green-building technique that can lower building heating and cooling costs and could help mitigate the urban "heat island" effect. The roof of the 12-story building on K Street is designed to absorb 56% of rain that falls on it, significantly reducing runoff, and building owner Blake Real Estate is offering tours to convince other developers and property owners to follow suit.

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