Tech-billionaire promises for a new city worth hundreds of millions — if they’re binding

The city-from-scratch that tech billionaires want to build in Solano County is getting the hard sell, with the backers promising new housing, better jobs and more — promises that will cost in the hundreds of millions, if not billions, of dollars — plus a pledge that county taxpayers outside the new community won’t have to pay for any of it.

The backers call these pledges, contained in a proposed countywide ballot initiative, “guarantees.” They say they’ll be legally bound to honor them.