Henry N. Cobb, who in 70 years as an architect — more than half of them in partnership with I.M. Pei — designed some of the country’s most prominent buildings, including Boston’s blue-glass John Hancock Tower, the tallest building in New England, died on Monday at his home in Manhattan. He was 93.

His death was confirmed by Ian Bader, a partner at their architecture firm, Pei Cobb Freed & Partners.

A Boston native who could trace his Massachusetts lineage to 1626, Mr. Cobb moved to New York in 1950 to begin his career, concluding that his hometown offered little promise.

“I had formed an opinion, not wrong at that time, that Boston was moribund,” he said in an interview for this obituary in 2010. “It was, in my view, self-satisfied, deeply resistant to change.”... [+]