Ah, to be young and live in Mountain View. Or to be in the prime of your career and live there—or to be retired there. Whatever your age, this Bay Area jewel is attracting lots of newcomers. It’s been fun to see the downtown area bloom over the last decade, and while there are plenty of great houses, I’ve found that the condo market is probably the hottest: condos sell within 15 days—and at 107% of list price. Those are unheard of numbers, and they’re driven by two groups: tech employees from Silicon Valley and retirees.