From what I've seen of SF rentals and landlords, that's potentially the most money he had spent on maintenance & renovations in a decade, while collecting some of the most profitable rent in the country.
https://smartasset.com/mortgage/price-to-rent-ratio-50-large...
They've made more money from appreciation than from rising rents.
Appreciation, by itself, will naturally drive this ratio down because of rent control laws. The value of the home is the denominator in that fraction.