The Temple or Sanctuary will be located in the center of the Holy Oblation.
A full description of the Temple and its courts is given in Ezekiel 40:1; 44:31. No building he has so specifically described has ever yet been built, so the prophecy cannot refer to any other Temple.
As there is to be no Temple in New Jerusalem, it must be a description of the Temple that is to be on the earth during the Millennium, [1000 years that Jesus will reign on the earth].