Amazon is seeking a new office in Boston's Seaport District, a move that could bring 2,000 employees to the city in the next few years.

The company filed documents this week with the Boston Planning and Development Agency to lease a building in the proposed Seaport Square development. Democratic Mayor Marty Walsh formally announced the project Tuesday, saying it puts a "tremendous vote of confidence" in the city's economy.

"Amazon is really looking to expand in the region," Walsh told NBC10 Boston.

Amazon and the developer are seeking $5 million in city property tax breaks, which would depend on the company creating at least 2,000 jobs in the area by 2025.

The company included Boston and neighboring Somerville on a shortlist of finalists for its second North American headquarters.

Walsh said the proposed office space is not connected to that search but it is still positive economic news.

The $5 billion project is estimated to generate up to 50,000 new jobs.