Decrepit old SFH selling for $1.6 million turned into a 4 plex here in Vancouver would see each unit in the 4 plex selling for $1.4+ million (maybe $1.1 for the basement suite). Friend bought in a converted old place 780 sqft attic suite $940k. It doesn't really make stuff affordable.
It was sold here as "the missing middle" and they basically dragged a mouse over huge washes of neighbourhoods like SimCity and said you could do 5 unit conversions. Fixer-upper SFH become gut out conversion SFH and are priced based on the investment of the 5plex conversion and what those can be sold for.