Renovation Question

Hi, I recently bought an apartment in a coop building. The sponsor owns and is renovating the apt above mine. They want to move the kitchen in that apartment and have asked to access the pipes through my ceiling. They say it will take two days maximum and a few hours at minimum. I’m wondering if I should let them do this and also what compensation I should ask for. I’ve never been in a situation like this before so any help would be appreciated.

Thanks.

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