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Officials hope to analyze the assessment in the coming weeks. The Park Service will also consider whether the monument could be reopened while the work is done, Mr. Lorenzetti said.

At ground level, beyond a fence that was put up at a 100-foot-radius around the towering structure to protect passers-by from possible falling debris, Belgian tourist Davy Paulus took photographs with his wife.

Like many tourists, he said he knew the monument would be closed, but that didn’t prevent the couple from stopping by during their visit to the city.

“It’s not something you want to miss out on,” he said.