Tech didn't cause this, homeowners did. If it didn't have a high paying industry you'd see blight and disinvestment instead, as you're only left with retirees who don't care about that stuff.

Seattle has unusually good building codes (single-stair is allowed) but no income tax, so in that way it might not benefit from tech as much.

It’s not SV, the entire West Coast from Vancouver to San Diego is like this now.