I've had one business letter from the UK which referred to me as "Esq."  I called the embassy and they said it was common for business letters.  This was in the 1980's.  Occasionally, I've received formal invitations addressed as "esquire," but it's uncommon and generally considered a bit pretentious. 

 I have never heard, or seen in the literature, that a Freemason is entitled to the style of esquire.  I do not believe that is correct.