2. A building used, subject to paragraph 3, for agriculture, or a building principally for the keeping of animals, provided in each case that—E+W
(a)no part of the building is used as a dwelling;
(b)no point of the building is less than one and a half times its height from any point of a building which contains sleeping accommodation; and
(c)the building is provided with a fire exit which is not more than 30 metres from any point in the building.