[rusty__]

It's just a film set. Pretty simple to make, probably put that together in about 5 days plus planning!

[jonplackett]

Do you reckon they actually did though, or just CGI?

[jack2222]

They built it, it's really not that difficult. The sky, view through window and trees around it look like they were added after. The top floor may have been a seperate piece perhaps.