I had a similar situation in my investment strata unit in NSW. There was a leak in my unit caused by common property plumbing. The strata plumber who came to repair the leak caused a major leak and my unit flooded. The tenant moved out, I lost rent and had to get new flooring. Thankfully I had an excellent property manager who continued stressing the major damage was caused by the strata’s plumber- so in the end the flooring was paid for, rent reimbursed and advertising for new tenant paid for.