Wow.

I mean, just wow.

Talk about missing the forest for the trees.

Hello, professor, you do not need a fancy math equation with percentage plots of house value to land value.

What you need are two words that appear nowhere in your discussion.

And those two words are Feng Shui.

About 98 percent of houses on the west side made it, intact, from 1940 to 1980, a 40 year period.

Then suddenly, in the mid to late 1980s, the demolitions began en masse, and after just three decades, many city blocks have more than 50 percent of old stock houses demolished, gone, with big new houses up, too large for the yard proportions and absent nearby trees.

Feng Shui.

Hint: The cultural/religious belief systems of a culture/ethnicity on the other side of the Pacific Ocean, it wants big new houses with bling and flash and no nearby trees and no hauntings or bad vibes of previous owners.

And also no number "6"s in the street address, but lots of 8's are good.

No need for percentage ratios...