SEATTLE — For more than a year, Amazon searched for a second headquarters, a home to as many as 50,000 workers that would be coequal to its current home in Seattle. Instead, Amazon is closing in on deals to split what it called HQ2 into two locations, according to people briefed on the discussions . The company appears ready to move to Long Island City in Queens, according to two of the people. It is also close to a deal to move to a spot in Arlington, Va., just across the Potomac River from Washington, one of the people said.

Much of the process has been secret, and Amazon had local officials and real estate developers sign nondisclosure agreements during negotiations. Here is what we don’t know so far.

Where exactly will the two sites be?

The specific location in Long Island City is not known, but about 10 million square feet of potential office space was identified in the area, according to a third person briefed on the discussions. Amazon exec utives used the term “campus” to refer to the location during negotiations, another person said.

Amazon estimates 170 square feet per employee, according to a 2017 email from Amazon to a Colorado official disclosed in a public records request.