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Have you exchanged contracts ?
I would be suspicious of the vendor not being aware of this works…. Normally these sort of things are in the pipeline for a long time and discussed at building mgmt meetings for a long time
I would be contacting the mgmt company of the building and see if they can help with your questions…
If you find out how long they have been aware of this for that may help with your decision.
I personally would be treading with caution and perhaps pulling out…. Unless you have that sort of money lying around to pay for it ? What if you are hit with a bill of £10K ? Do you have a plan for that senario ?
Also might be worth having an ask to see the building mgmt accounts to see what’s in the fund and how much they plan to pay towards the repairs.
Good luck