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Well second edition took a much more controlled look at money than 1st edition did. It worked hard to eliminate the idea of someone simply using a wealth loop to get more wealth, to get tools and magic items that made them naturally work at a level higher than their actual level.
You can see this premise work out as now Crafting largely becomes a narrative choice, which is potentially less efficient than simply working and buying your item, presuming the item would be generally available where you are.
With that in mind, a 2e version of such rules would probably focus on any 'structure' the character owns as having some assigned level. That level would limit the effects its features might be able to provide to itself and/or one of the players. This would keep players from getting outside of their proper power scope.
Any such subordinate entities would probably normally be capped level-wise to the level of the PC owning the entity. If it is an entity that a PC might have more than one of, it wouldn't surprise me to see such entities limited to level below the PCs level, and limit the number of such entities that the PC could control or have it have actions, similar to limits on number of Minions.
These rooms would be bundled together to form the entities which would sort of be 'Downtime Minions'. (and generally minions are capped below the existing players level by one or even more levels)
You might want to look at the rules within Age of Ashes adventure path. It actually does have some rules for how you can repair and refurbish some rules in your 'castle' you get in the AP, how much it costs, and what benefit it provides as a party.
You might have some success looking at these rules creating downtime only party members, and have these party members primarily provide some various niche benefits to the PCs under certain circumstances, and otherwise work to maintain themselves, growing if the PC level has gone up and offers options for growth, and have these things ideally not generate a cost to the players. The more such investments the players have the more chance they get use out of the resource, but potentially might increase the chance there comes an unexpected 'cost' that would have to be paid to upkeep the resource.
Don't know that this helps, but again if you need existing rules, you may need to look at Ages of Ashes. If you want something more fleshed out, that may take some development. I do believe there were new kingdom rules in the second edition kingmaker edition, but I haven't had a chance to play them. My understanding was that a number of people suggested some significant rebalancing rules for those rules however.