A property owned by millionaire businessman Donghua Liu is being investigated due to overcrowding, safety issues and sanitary concerns.
Auckland Council confirmed today it had received a complaint about a 1940s property near Newmarket's motorway overpass owned by the property developer.
Compliance manager Stefan Naude couldn't say more while the property was under investigation.
Fourteen people share a single toilet at the "disgusting" rental which features rotting floors and mould, a former occupant told Fairfax NZ.
Mr Liu was at the centre of a political storm in 2014 over his links to both Labour and National as he sought residency and then citizenship.
Maurice Williamson resigned as a minister outside cabinet in May last year after it was revealed he rang police to inquire about Mr Liu's domestic violence case.
Last month two domestic violence charges which were laid against Mr Liu were dropped.