<p>Construction workers hoisted a green-and-white Starbucks sign onto a quaint, brick building in Oak Park recently. It was a big moment in one of the poorest sections of Sacramento.</p>
<p>Due to open in spring, the coffeehouse is a key tenant in a redevelopment project named 40 Acres, former NBA All-Star Kevin Johnson's $4.4 million attempt to inject a jolt of economic caffeine into the troubled neighborhood where he grew up.</p>