24th Street is in two parts. 24th Street starts at First Avenue and it ends at Madison Avenue, because of Madison Square Park. 25th Street, which is in three parts, starts at FDR Drive, is a pedestrian plaza between Third Avenue and Lexington Avenue, and ends at Madison. Then West 24th and 25th Streets continue from Fifth Avenue to Eleventh Avenue (25th) or Twelfth Avenue (24th).
Is there an answer to this question (If it cannot be answered, say "unanswerable"): Where does 24th street start?
First Avenue