*OP = Original poster
I don't think i posted for several years, but my god people, control yourself, don't bash the OP, he just asked for help, and you are being typical internet trolls.
Second, Tom Sloper has my thumbs up, he did his job, this thread WAS posted on wrong forum.
The fact that OP didn't like answer Tom Sloper gave, to which answer i agree with, no need to explode on him like that.
To the OP:
Where do i start... I'd need to write a book here because the question is comparable to "How to make million dollars in a year", so here i go.
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"I sold my house 'bout to finance a game development"
That is like the worst thread name iv'e seen in a long time. What you are asking for is to get harassed, and that's exactly what is happening.
Start with making a new post, with specific question in it, WHY THE PHUCK did you even mention you sold your house?
"So I already sold my house so please do not try to tell me how "it is destined to fail". I only have one life I am willing to try some"
You don't have time for negativity... Take a breath, you can do this, but you have to be smart about it.
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So when viewed from above entire earth would have its properties and behaviors and characters but then again zooming in to the city, rules and characters change and then of course once inside of a building new characters and rules. So on the streets we would have cars and clours above them. Inside of the building we would have a human standing and a toy car driving around him.
Basically a level within a level within a level.
Keep in mind, other than playing some games I have 0 experience in these things especially coding.
So when I meet some programmers, I have to tell them what to do. What technique is best for this? what coding language? What game engine? Is Unreal engine suitable for this?
What not to do: is not ask random people on internet to give you potentially fundamentally wrong information upon which you will build your foundation on.
What to do: Rent expert in field of programming? Present your idea, and give him time to research, do his thing, and come up with the answer to your question.
My 2 cents:
Completely doable project, your idea is unique, and if executed could be a good visually themed game.
What you described is very possible with smart masking of load times(Because there needs to be switching of levels, it cannot be all persistent That wont fit in typical 8-16 Gigabytes of PC ram memory)
What i want to ask you is:
Why should i play the game you described, if i want to see a house view and car doing circles around human inside of it i'm pretty sure there is The Electronic Arts The Sims 4, which i can assume you cannot rival to compete with attention of teenage girls or anybody playing that type of games.
Is your view of Universe, or planetary systems going to rival what's out there already? if not? why have it in first place?
Is your street view going to be any interesting, what is it going to have, what can the user do there except click to zoom inside specific house.
Sound's like your first step! don't be discouraged by internet trolls, but also a word of caution, your goal project has bean done before...
partially by other games, like i can name few games that you need to combine.
Check if you have funds to make all of these games and if so, id be interesting to play your game.
The planetary view:
https://www.nomanssky.com/
The house and street view:
https://www.ea.com/games/the-sims/the-sims-4/pc/store/mac-pc-download-base-game-standard-edition
Offcourse count in that you wont be using all functionalities of these games, but only part of it. But for example those are two main competition you have on market that i can think off in span of minutes.
Edit: oh and, good luck!
It was a good reminder to be kind to anyone, and always love no matter who they are or how they treat you 
