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Housing [land] prices have been grinding higher long before the Great Decline in interest rates

That chart seems to only go back to 1987, which is after the decline in interest rates started: https://fred.stlouisfed.org/series/REAINTRATREARAT10Y

According to this, home prices were mostly flat from 1900 up until the 1970s. The proves the opposite of the point you are trying to make.

This is adjusted for inflation