Maybe a 4x price increase is indeed excessive, but building a house like it was possible 50+ years ago, would be just illegal.
You are right if we go older. But we don't have to go far to prove the point.
I could barely afford a house built as a hunting bungalow in 1918, expanded multiple times, in the 60s-70s a lot of unpermitted work was done. Trying to get work done was a nightmare because nothing was to code (some reputable contractors refused to do work). Sure, the appliances were fairly new, the pipes and some of the electrical had been updated, but all of those were relatively minor expenses and most of the upgrades were aesthetic.
Your insurance splits out the cost of the land and "improvements" (the structures) because you're only insuring the house because a flood/fire won't destroy the land. In my case, the cost of rebuilding the house dwarfed the cost of the property itself.
The cost of improvements on land has decreased.
Of course, Cambridge and many areas of Boston proper are quite expensive (as are some of the tonier suburbs like Concord).
Silicon Valley is a bit unusual in that you can't really escape from high prices, in spite of being suburban sprawl, because of the geographical constraints.
But the most job growth in the country requires that people move there (here) and they require houses when they arrive. With that surprising increase in demand, I expect I could get $250,000 for my house now, which is a staggering increase in a fairly short period of time.
On the other hand, if you're coming from a place where houses are selling for $1,200,000 (the 4 * $300,000 suggested above), then maybe you still see $250,000 as being affordable. We certainly have jobs. Every place of business in the area seems to be hiring.
Unless you have different priorities, which is fine. Like I could afford some stuff, but "can't" cause that wouldn't let me afford other stuff my parents never had.