"One of the beautiful symbolisms given us in the book of Revelation is this one of the holy city "coming down from God out of heaven." When John said that this city comes down from God out of heaven, he wasn’t talking about coming down past Mercury, Jupiter, and Mars. He meant not that it would settle down over the mount of Olives or any other geographical location. In the Bible a city represents a government, and the "holy" city is a righteous government. It is not a man-made government. It doesn’t have a "Democratic," "Republican," "Reform," "Labor," or "Conservative" party. It emanates from God, out of the celestial or spiritual realm, that is, out of the heavens of the Spirit of God, and is established on earth through a heavenly, spiritual people. We often think with such carnal minds! We hear of a city "coming down from heaven" and imagine it appearing one night in the sky. Jesus once asked the Pharisees whether John the Baptist’s baptism was "from heaven" or from men. With the same carnal reasoning we could picture John’s baptism somehow mystically floating down through the sky and landing in the Jordan River! Of course, that’s not what Jesus meant. When He spoke of John’s baptism being "from heaven" He was simply asking whether it originated with God, or whether it originated with men. May the blessed spirit of revelation grant us the clarity to see that this city shall never rule until it has in all truth become the "holy" city, prepared, adorned, and "made ready." Oh, yes, she is being prepared and being adorned."
Much more in the link:
https://www.godfire.net/eby/Rev/rev242.html
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"John saw the city descending from God, and it is descending from God. With every message of God that is preached, the Holy City is coming down to earth. With every person that is born from above, thus becoming a citizen of that city, it is coming down to earth. With every saint who receives the anointing of the Holy Ghost sent down from heaven, the Holy City is coming down to earth. With every member of God’s elect who grows up another step into perfection, into the image and likeness of the Holy One, the Holy City is coming down to earth. With every revelation that comes to us from the Spirit of God, taking us onward into the perfect fulfillment of God’s great plan and purpose in our lives, the Holy City is descending to earth. As the principles of the kingdom of God — righteousness, peace, and joy in the Holy Ghost — are established in our lives, the Holy City is coming down from God out of heaven. When the nature and character of our heavenly Father are formed in us, and His precious mind rules our hearts, the Holy City is descending to earth. With every victory over sin and sickness, over limitation, darkness, and death, the Holy City is descending to earth. Beloved, it will continue descending with the development of the body of Christ into its full stature. All of this that makes us the city comes down from God out of heaven! That is the mystery. It will descend and descend and descend until the prayer that Jesus taught for sons is fulfilled: "Thy kingdom come, Thy will be done in earth as it is in heaven."