Movie with brutalist building, missing architect

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I only remember a few details about this movie (perhaps from the late 90s, early 2000s, could be wrong) – a couple is moving into a brutalist concrete building, the architect/builder had gone missing, they end up discovering a secret inner core to the building where the guy walled himself in.

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Sounds like “Walled In” (2009)

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Thanks, I think it is “Walled In (2009)”! The story is not quite what I remember, but the building shown in the trailer looks right.

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