Need Room for Rotational Play in Sunset Valley

I see you got the help you needed don't know if you're gonna share here or somewhere else but I like ts3 rotational play a lot of times I will have saves in different worlds for it but I will branch out with family and friends in the same world from time to time. I started it cause people always told me it's not "built" for rotational but it's for whatever you enjoy.

World Adventures. Your sims can live there with the right visa. There is also an NRAS mod called Traveller or it could be Mover or both that allows you to live in other worlds like University.

You can have children at the World Adventures but not at University. I don't know about aging either. That's without mods. 

What puzzlezaddict said too, Edit Town. It never occurred to me about it having an address though. I don't know if that would matter, does it affect anything technical? 

Try a water property, like a houseboat, or a waterfront property. With the Town Edit tool. There should be a few vacant lots already. If you haven't used up some of the spare community lots and don't plan to, you could change the zone/lot type of those to residential as well. And demolish one or two community lots that you never use, and change the lot type of those, and one or two residentials you don't like. Or many. Surely, they will add up to enough.

I had a family who had too many babies and so when they grew up there was no room for them all to have a second or third generation and I didn't want to not control them, flapping in the wind out in the neighbourhood all on their own. So I made a copy of the game/world/family, moved half of them to a new world where they took the gravestones and urns of everyone they could with them, to preserve those relations, and the other half moved to another world with the gravestones too and their other corresponding dead relatives too, by marriage. So then I had 3 or was it 4, copies of them. 2 still in Sunset Valley not being played anymore, and 1 each in the new worlds being played as branches, and in my imagination and the story they talk about each other as though they heard the gossip or spoke on the phone. If you don't take the gravestones including the one's in between, they don't turn up in the family tree. That was the Plunkett family on my My Sims page, and turned out to be a pretty good story. 

A few suggestions there. 

DanaePlatinumP  You can actually place new lots in Edit Town, without needing CAW.  The Add Any Lot Size mod (compatible with whatever else you're using) may be useful in that context:

https://modthesims.info/download.php?t=471164

You'd need NRaas Tagger to give the new lots their own addresses.

But if that's not enough, and it may not be considering the size of the SV map and the number of descendants you're considering, it may be better to use either an updated version of SV or a different map altogether.  You could use NRaas Porter to import the SV sims to a new world without them losing the relationships outside their households, if those matter to you.