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I wish they weren't zoning more single family homes but the true vacancy is not a few empty houses but the fact that the houses are not apartment complexes.

The vertical space is the true vacancy. When people say the LA vacancy rate is higher than the homeless rate this implies A) apartments empty because they are switching leases or getting renovated are usable (they aren't) and B) also implies that everyone who wants their own housing has it (not true - plenty of young people are living at home and plenty of people are crammed into apartments with strangers they don't want to be).

Until you build enough housing for everyone who wants a house there isn't enough housing.