Hi Duane,
In Scripture they sometimes use a dwelling to represent the physical body, like a "tent."
2Cor 5:1 For we know that if the earthly tent we live in is destroyed, we have a building from God, a house not made with hands, eternal in the heavens.
v. 2 Here indeed we groan, and long to put on our heavenly dwelling,
v. 3 so that by putting it on we may not be found naked.
v. 4 For while we are still in this tent, we sigh with anxiety; not that we would be unclothed, but that we would be further clothed, so that what is mortal may be swallowed up by life.
Now if you would try to compare our physical "tent" with what our spiritual body would be like you could say it is a "mansion."
John 14:2 In My Father's house are many mansions; if it were not so, I would have told you. I go to prepare a place for you.
The body, both physical and spiritual is what holds the essence of a being, the character, personality and very nature of who that being is.
In Rev. 21 when "New Jerusalem, coming down from God out of Heaven," this represents the kingdom of Christ and the Elect. It speaks of the streets of gold and the walls all covered with jewels, this of course is not literal. But these are extraordinary things, unique, rare and precious that represents the qualities/essences of the city/kingdom/beings of which this is made of.
1Cor 3:11 For no other foundation can anyone lay than that which is laid, which is Jesus Christ.
v. 12 Now if anyone builds on this foundation with gold, silver, precious stones, wood, hay, straw,
v. 13 each one's work will become clear; for the Day will declare it, because it will be revealed by fire; and the fire will test each one's work, of what sort it is.
v. 14 If anyone's work which he has built on it endures, he will receive a reward.
v. 15 If anyone's work is burned, he will suffer loss; but he himself will be saved, yet so as through fire.
v. 16 Do you not know that you are the temple of God and that the Spirit of God dwells in you?
v. 17 If anyone defiles the temple of God, God will destroy him. For the temple of God is holy, which temple you are.
So don't think of a actual building, because the mansions, like the temple are the people that may it up, not with walls of a building at all. Jesus said "I go to prepare a place for you," He is preparing "a bride," the Elect to reign with Him.
Rev 21:2 Then I, John, saw the holy city, New Jerusalem, coming down out of heaven from God, prepared as a bride adorned for her husband.
Hope this helps
mercy, peace and love
Kat