On Evil Grounds (2007)

Romeo and Juliet - a couple that has a very odd perception of their relationship. They decide to buy a loft situated in a run-down factory. Somenone already lives there. The deranged owner of the factory, and his buddy, the real-estate agent, have been living an exciting life of capturing and torturing young and innocent couples. Too bad Romeo and Juliet are everything but docile victims!