I live on the third floor of a condo in Florida. I found that I have a leak at the kitchen drain. There is apin hole sized leak under the sink but there is another leak behind the plastered wall behind the cabinets. The leak is going out into the cement that supports the common porch and I'm afraid that it could rust out the rebar in the cement. Is this my responsibility or the associations? I would appreciate any help you can give me. Thanks