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About three months ago, my neighbor renovated his bathroom. We have a common wall between the master bathrooms in the condo. When he flushes his toilet, my toilet bowl drains. He installed a new efficient toilet. The building was built in 1993. No idea as to why this is happening. Ideas?

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Sounds like a problem with the venting. Your neighbor's toilet is likely not vented properly, so when they flush it siphons your toilet.

Contact a local plumber, and/or the building manager, and have the problem investigated.

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    I'm guessing neither side is properly vented, could be one vent for both units and it has clogged.
    – BMitch
    Commented Jan 11, 2016 at 21:28

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