I don't think all the McMansions and condos are good however. I'd rather you force people to add space for lots of people. Otherwise there'll be a period where you drive a lot of poorer folks away. Artists and retail workers and mechanics. People who don't work tech or finance or real estate. I don't know that cities can readily recover from it.
It's why I left San Jose. If it continues too long, it'll be why I leave Seattle. Give people reasonable rents, please. I want to live with artists and civil servants and retail workers and chefs and vets and all these people. It makes life so much more interesting