SEATTLE — Often a corporation with a grand dream to reshape a city wants tax breaks in return. Not Amazon.

When Amazon executives showed up last year for the first meetings about their proposal to build a new headquarters here — three towers that would draw thousands of workers downtown — city officials were taken aback. Not by the scope of the plan, but by the simplicity of the discussion. The executives said they were ready to break ground immediately on what would be one of the biggest development projects in city history.

“It was not a hard-boiled negotiation,” said Marshall Foster, the director of city planning. “They basically walked in and said, ‘We think this is the site.’ ” A shovel-ready company that clear and confident, and with the cash to back it up, “doesn’t happen very often,” Mr. Foster added.

Jeffrey P. Bezos, Amazon’s founder and chief executive, has a reputation for the grand gesture, a knack for seizing an opportunity that can remake a landscape. His purchase of The Washington Post this month for $250 million cash, a bet that others might have shied away from, is a case in point.