Mould

Hello again, We have an apartment (12 yrs old) in Sydney, we have notice in the last couple of months mould starting to appear on an external wall at the corner of the building. It is definitely getting worse week by week. It appears the “dampness” causing the mould is coming through the external wall. Is this something Strata would be responsible for or is this an owners responsibility?

Cheers in advance. Kev.