omorrow morning at 09h00 I can meet the co owner or the contractor to know what they want to do and what is the impact on the common area ceiling. BUT they cannot do any work without given deposit before. I think 6000 will be ok but I have to confirm after knowing what is the work (maybe less or higher).
It is clear that every time a co owner needs to work on the common area like in this case, the payment of a deposit is required and will be returned only if there is no damage and when the repairs are done in the right way