Zec 14:4
And his feet shall stand in that day upon the mount of Olives, which
is before Jerusalem on the east, and the mount of Olives shall cleave in the midst thereof toward the east and toward the west,
and there shall be a very great valley; and half of the mountain shall remove toward the north, and half of it toward the south.
This avelanche - this split mountain - it doesn't say this is a place Christ went to prepare for us to live - in fact that would be pretty bleak to live in the rubble of a mountain that had split in two.
There is metaphorical language of a BLENDING of earthly and celestial - New Jerusalem COMES DOWN OUT OF HEAVEN, etc. etc.
Incidentally, the 1000 year reign is only mentioned in Revelation in the Bible - other apocalyptic literature proposes a 400 year reign - which strikes me as a warning not to be too literal with these numbers.
Is 144,000 a literal number?
I heard that David Koresh once went to Israel to see if 144,00 people would fit in a certain space...