The law in Victoria is pretty clear on OCs’ responsibilities on common property.
Section 4 of the Victorian Owners’ Corporation Act says” An owners corporation has the following functions— (a) to manage and administer the common property; (b) to repair and maintain … the common property;
Section 46 says “An owners corporation must repair and maintain (a) the common property; and (b) the chattels, fixtures, fittings and services related to the common property or its enjoyment.
So you could go to your OC and give them an option – sell you the land with conditions attached that you will maintain and repair it or, alternatively, tidy it up and restore it to its former glory as required by law.