300.Usually, affirmative burdens are enforceable only against the owner of the burdened property (section 9(1)); but since an ‘owner’ includes a person whose title has not been completed by registration (section 123(1)), the identification of the current owner may not always be easy. Section 70assists the enforcer by requiring any previous owner to pass on information. See section 8(2) and (4) for a list of those who have title to enforce a real burden.