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I love the second one and the last one, a mix of them will be great :) do you live in a city or out of city? because here in my country there are a lot of building but i live in a place with nature and i love it

Right now I live in the suburbs of Tulsa Oklahoma and this treehouse would have to pass city codes. I don't know if the city would allow this kind of construction along with housing associations. But in the country the building codes are not as stringent, depending on the state you may have to file for construction or you can build what ever you wish if it's under a certain square footage.