For the purposes of this Act, where:
(a) the recipients unit of accommodation (in this section called the shared unit of accommodation ) in relation to a housing fringe benefit in relation to an employee in relation to a year of tax consists of accommodation in a house, flat or home unit; and
(b) throughout the tenancy period, there ordinarily subsisted 3 or more other housing fringe benefits, where each of those other housing fringe benefits was a housing fringe benefit:
(i) where the recipients unit of accommodation consisted of accommodation in the house, flat or home unit; and
(ii) in relation to a different employee;
the shared unit of accommodation shall be taken to be eligible shared accommodation in the house, flat or home unit in relation to the year of tax.