To some, “master builder” remains as dirty sounding as ever:

The question trails Robert Caro like a fly, buzzing in his ear. Over and over, at cocktail parties and museum receptions in the past few years, he hears variations on the same query.

“Doesn’t New York need a new master builder?” people ask. “Don’t we need a new Robert Moses?”

Mr. Caro, 71, sits in his spare writer’s aerie high in a Midtown office building, an owlish man with a faint smile. His answer has the virtue of concision:

No.

Maybe we really need to be wondering if New York just needs a new Robert Caro.