Newly renovated houses and unoccupied houses upstairs were blocked by water pipes and infiltrated into my downstairs. Who should be responsible for this situation?

In this case, if it is a property established by the developer himself, you can find the developer or the property; If entrust property management, direct property. If it is really not possible, don't pay the property fee. He didn't dare to stop your water, after all, you didn't default on the utility bill. No unit or department, including power supply bureau and water supply company, can cut off the power supply without informing residents.

In addition, you can ask them to compensate you for the renovation costs.

If it can't be solved, I suggest you report the situation to the Urban Construction Bureau, Housing Authority and other relevant departments.