3.—(1) Accommodation for the elderly in which a person has his only or principal home.
(2) In this paragraph “accommodation for the elderly” means residential accommodation to which sub-paragraph (3) or (4) applies, but which is not a dwelling within the meaning of paragraph 1 or a house in multiple occupation within the meaning of paragraph 2.
(3) This sub-paragraph applies to residential accommodation—
(a)which is particularly suitable, having regard to its location, size, design, heating systems and other features, for occupation by elderly persons,
(b)which it is the practice of the landlord to let for occupation by persons aged 60 or more, and
(c)where the services of a warden are provided.
(4) This sub-paragraph applies to any building or part of a building designed or adapted for use as residential accommodation for elderly persons.