Preservation of what culture anyway? You can't prevent people from buying existing housing, as one example, so what happens if you try and preserve the form by

Preservation of what culture anyway? You can't prevent people from buying existing housing, as one example, so what happens if you try and preserve the form by not constructing any new housing, is that wealthier people win that particular game of musical chairs... ... and you've changed the culture anyway, if not the form, because you have a new set of people there.