vanovebeke As you have found out, you can't edit residential rentals the way you have described you're going about it. Building and editing that venue type is different and pickier than the other venues. To build or edit one, the lot must have no sims on the lot (tenants, landlords or visitors), none of the apartments can have tenants, it must be unowned, and you must enter the lot in build mode from the map to do almost everything, particularly things like move walls, edit roofs, etc. So, to edit what you've built, you are going to have to evict the tenants, send the landlord back to their home lot or move them into another lot, and have the landlord sell the lot. Then you can go to Manage Worlds, enter the lot and make your changes. Once done, you can have a sim buy the lot, add tenants and play on.
While not required, I also suggest you change the venue type from residential rental to residential when you build or edit a lot that already is, or you intend to be residential rental. After you finish building or editing, then save the lot to your Library as a residential then change the venue to residential rental and assign the spaces. Once done, save it to you Library again as a residential rental. Doing that gives you options if you need to make any significant changes to the lot later on if you find anything you don't like/doesn't work like you want it to.
Hope this helps.
Community Manager
