Orewa Property maintenance man Wayne Witham said he smelled a "weird, smoky smell" all day Friday as he worked repairing a unit above the dead man's flat. He tried unsuccessfully to find the source of the smell.
Next door neighbour Luke vanDam, 19, also noticed a smell of smoke the entire day but couldn't see any sign of fire.
Front unit neighbour Bird Thompson said the man, who neighbours named Michael Maddock, shifted into the block of flats this year but was keeping poor health.
The same block of flats was the scene of a violent death two years ago.
Gary Marshall was stabbed to death and Natalie Theresa Ford was later acquitted of murder following a High Court trial. She claimed to have been defending herself.