I would think the biggest concern is creating a twin bubble of tech startups and housing. Then when the tech bubble pops you get all the real-estate developers

I would think the biggest concern is creating a twin bubble of tech startups and housing. Then when the tech bubble pops you get all the real-estate developers soaked by the sudden calamitous drop in the value of the housing units they put up (which assumed a steady supply of people moving in with six-figure incomes).