Read the footnote:
Quote:This view is based on three arguments: (a) the setting reflects the final separation of Church and Synagogue, about 85 AD; (b) it reflects the capture of Rome and destruction of the Temple by the Romans in 70 AD; © it uses Mark, usually dated around 70 AD, as a source. (See R.T France (2007), "The Gospel of Matthew", p. 18.) France himself is not convinced by the majority – see his Commentary, pp. 18–19.