There's a difference between reasonably talking to someone up front and asking if you can coordinate (though that's still rather presumptuous; we have to deal with HOAs and busy-body neighbors IRL, already), and demanding someone completely remove a decoration they've already paid for (and most likely not put something back in its place, because any chimney could be in the way). That's just a bratty, entitled mentality. If Chevronone wants a chimney he bought on the house he bought, he can have that chimney.