The November 27 1953 edition of the Toronto Daily Star contained this ad for a hotel in Miami Beach:
The ad doesn’t provide any details on which specific Orthodox rabbis were serving as a reference.
I did some Google searching, and turned up an ad for a plate for sale from the hotel, and an ad for the hotel from a 1970 edition of the Indianapolis Jewish Post. I also saw the odd postcard or two from the late 1960s. The 1970 reference was the latest I could find, and apparently condos were built on the site in 1991.