DENVER (AP) — Denver has submitted its pitch to lure Amazon's proposed second headquarters.

The private Metro Denver Economic Development Corporation says it submitted a regional proposal on Wednesday.

Details of the bid were withheld. Officials with Denver and other cities, counties and entities that put the bid together were required to sign non-disclosure agreements on its contents.

Sam Bailey, vice president of economic development for the economic development group, says the proposal includes as many as eight metro-area locations where Amazon could build its operations.

Seattle-based Amazon is promising $5 billion in investment and as many as 50,000 jobs over the next decade and a half. It's expected to pick a location next year.