700. Deemed fulfilment of landlord's residence condition.

During any period when:

  1.  

    (1)     the interest of the landlord1 under the tenancy2 is vested in trustees as such; and

  2.  

    (2)     that interest is held on trust for any person3 who occupies as his residence a dwelling house which forms part of the building or, as the case may be, flat in question,

the landlord's residence requirement4 is deemed to be fulfilled and, accordingly, no part of that period is to be disregarded