There is a cloning tool in LR but it's really slippery. I rarely use it for specific imagery to eliminate (like people) but only spots, dust, and maybe a car covered up by a bush.
I have been retouching (this is not editing, this is RETOUCHING) for a long time and even I would send this out to a pro. Someone here might be able to do an ok job on it but I see too many specific background elements that need to be reproduced
in order to make it look real.
Don'tcha hate it when the wrong person is right THERE? I get this request a lot and have to break the bad news to my clients.
This has to be done in Photoshop. Sorry!