How many letters does the top answer for “home of gracie mansion” have?

The most common answer is manhattan (9 letters).

Crossword clue: home of gracie mansion

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

manhattan 9 letters wd-fact-v3

one of the five boroughs of New York City

home of chungking mansions 50% similar → yautsimmongdistrict

home of mansion house 50% similar → cityoflondon

home of playboy mansion 50% similar → losangeles