Thriller movie (2000-2010)

I am trying to remember the name of a low budget thriller type movie I seen on sky movie chamnels(uk) it was about a couple who moved into a new apartment block inhabited by weird over friendly neighbours who kept inviting them to a party. One by one people started dying but then towards the end they all came back to life for the party which I think was on the roof. I can’t remember if they had all been actors or if it was just a weird game type initiation. It was definetly a 2000’s film and I think before 2010. Please help

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