“257 HMOs: certain converted blocks of flats (1)For the purposes of this section a “converted block of flats” means a building or part of a building which— i. has been converted into, and ii. consists of, self-contained flats. (2)This section applies to a converted block of flats if— (a )building work undertaken in connection with the conversion did not comply with the appropriate building standards and still does not comply with them; and (b) less than two-thirds of the self-contained flats are owner-occupied. (3) In subsection (2) “appropriate building standards” means— (a )in the case of a converted block of flats— (i) on which building work was completed before1st June 1992 or which is dealt with by regulation 20 of theBuilding Regulations 1991 (S.I. 1991/2768), and (ii) which would not have been exempt under those Regulations, building standards equivalent to those imposed, in relation to a building or part of a building to which those Regulations applied, by those Regulations as they had effect on1st June 1992 ; and (b) in the case of any other converted block of flats, the requirements imposed at the time in relation to it by regulations undersection 1 of the Building Act 1984 (4) For the purposes of subsection (2) a flat is “owner-occupied” if it is occupied— iii. by a person who has a lease of the flat which has been granted for a term of more than 21 years, iv. by a person who has the freehold estate in the converted block of flats, or v. by a member of the household of a person within paragraph (a) or (b). (5)The fact that this section applies to a converted block of flats (with the result that it is a house in multiple occupation under section 254(1)(e)), does not affect the status of any flat in the block as a house in multiple occupation. (6)In this section “self-contained flat” has the same meaning as in section 254.”