PITTSBURGH — Two major downtown Pittsburgh streets remained closed while workers shore up granite on a historic building where a 1,400-pound chunk plunged nearly 300 feet to the street below.

City officials hope to reopen the northbound lanes of Grant Street — those farthest away from the Frick Building — by Thursday. But officials on Tuesday say it could take weeks to reopen the southbound lanes nearest the building or Forbes Avenue, a narrower street that runs along the other side of the corner building.

The granite fell about 2:45 a.m. Monday from a decorative cornice. Nobody was hurt.

Crews worked to shore up the decorative stone, which likely weakened due to water seepage and age atop the 21-story office building that opened in 1902.

A protective wall must be built before northbound Grant Street reopens.

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