From the Act:
“owner”, in relation to a residential property, means—
(a) a person (other than a mortgagee not in possession) who—
(i) in the case of a residential property that is let under
a lease or held under a tenancy for a term not
exceeding 20 years, is entitled to receive the rent
under that lease or tenancy whether in his or her
own right or as trustee or agent for another person,
or
(ii) in the case of a residential property that is not so let
or so held, would, subject to paragraph (b), be so
entitled if the residential property were so let or so
held, whether in that person’s own right or as trustee
or agent for another person,
or
(b) where the property is let under a lease or held under a
tenancy for a term exceeding 20 years, the person (other
than a mortgagee not in possession) who is the lessee
under that lease or tenant under that tenancy;
It seems like a very cumbersome definition.
It comes down to the question: are you the person who, if you had to prove you owned a property, could do so in a Court of Law.
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