Amazon has triggered a $5 billion bidding war — here are 7 of the most ambitious site proposals for its new headquarters

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In early September, Amazon announced that it plans to build a $5 billion campus, dubbed HQ2, and bring 50,000 jobs to an undetermined North American location.

At least 50 cities in the United States and Canada are expected to submit proposals for sites they believe would be the best fit for the e-commerce giant.

For some cities, the offer sounds too good to pass up. Many are offering generous tax incentives and opportunities to develop huge swaths of land to the company.

Here are some of the most ambitious sites that cities are proposing for HQ2:

Chula Vista, California — an 8 million-square-foot site near the US-Mexico border that would include "the world's first binational university"

Chula Vista, a city 10 miles outside of downtown San Diego, California, promises to give Amazon 8 million square feet of space next to a larger redevelopment project.

Called "Millenia," the 20-year project calls for 11 new neighborhoods that will house approximately 60,000 new residents, according to the city. The plan mostly focuses on new housing, though it also includes a giant office park, more retail space, and a hotel.

The city's proposal, called "Welcome Home Amazon," also calls for the creation of "the world's first binational university" near Amazon's headquarters — which would have campuses in both California and Mexico.

Millennia will be completed whether or not the company comes. If Amazon picks Chula Vista, the deal will also include a $400-million tax incentive package.

McKinney, Texas — a 2,500-acre development for 30,000 people

The North Texas area is proposing several sites for Amazon's HQ, including one that would include a 2,500-acre planned district in McKinney, Texas, according to Dallas News.

Located around 35 miles outside Dallas' downtown, McKinney wants to entice Amazon to a $300 million mixed-used development called Honeycreek. The first section, which will include 313 acres of single-family residential units, commercial, and retail development, is set to open in 2019.

The project is expected to house 30,000 people, and include two lakes, 300 acres of green space, farmers markets, a 200-acre office park, and commercial space.

Dallas, Texas — a development surrounding a proposed station for a $15 billion bullet train

Developers from the firms Matthews Southwest and Texas Central Partners are pitching a transit-oriented development for Amazon's HQ2 campus, according to the Dallas Business Journal. It would surround a proposed station for a bullet train, which Dallas magazine reports is expected to cost $15 billion. If approved by the city, the 240-mile line will transport passengers from Houston to Dallas in 90 minutes.

Houston Mayor Sylvester Turner has formally expressed support for the train plan, which is likely to happen with or without Amazon. Developers hope to start construction on the development by late 2018.

See the rest of the story at Business Insider