Owner of the building was Italian who has or had a large family(3 kids or more - probably two daughters) and is from south eastern part of London - originally from outside of London some 40 kilometers + from London center

Building must have been built/renovated whatever even in 1988 - 1990. Italian or half Italian... https://ausertimes.blogspot.com/2024/02/here-is-what-harrys-indirect-death.html 

HALF ITALIAN IS CORRECT ANSWER - I RECALL HIS MOTHER. THIS MAN ALSO HAD A HOUSE WHERE HE IS FROM....SINGLE MOM, SISTERS. I do not recall his father where he is from, but am certain was involved too.