Help surprise after EGW purchase, rights and duties of the owner

Hello everyone, I warmly greet you! My husband and I (son 1 year old) have bought a condominium on the 2nd floor with a garden in a two-family house for next year. Above us is a 2.5-room apartment of 50 sqm that is rented out and the owner does not live in the house. The complex has a manager who handles everything with the maintenance fees etc. Unfortunately, it is d

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