@crinrict I'm having this issue or a similar one. Will make a new thread if it is different.
My issue comes in the Landgraab apartment. I bulldozed everything in it (interior walls too). Basically deleted everything in the apartment that is able to be deleted. Since I can't bulldoze exterior walls or exterior windows.
I'm trying to place a new staircase in a different location after deleting the original staircase in this apartment. Several times I get the error mentioned by OP. I'm not sure if this happens with other BB objects, but it is definitely happening when trying to place stairs.
The stairs do fit into the owned area of the lot as well. I can place these stairs flush against an exterior wall on some areas, but not on others. Using the move objects cheat did not help it entirely but it allowed me to place straight stair cases in some areas I couldn't before.
Will post more about it if more info is needed. I do use mods and CC but nothing that affects BB mode.
