Tower 55 (formerly the Market Post Tower; also known as the Gold Building or simply 55 South Market) is a 15-story building at the corner of South Market Street and Post Street in

downtown San Jose Downtown San Jose is the central business district of San Jose, California, San Jose, California, United States. Downtown is one of the largest tech Business cluster, clusters in Silicon Valley, as well as the cultural and political center of Sa ...

California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...

. Built in 1985 as the Market Post Tower, it was designed to provide a mix of office and retail space. When first built, the building was controversial due to its gold-colored glass exterior, which produced high light and heat reflection. In its early years, the owners struggled financially with the property and were forced to put it up for sale in 1987. While the intended tenants did not materialize, the building proved popular with telecom carriers as an Internet exchange center, with

MAE-West MAE-West was an Internet exchange point located on the west coast of the United States in Silicon Valley, in the south San Francisco Bay Area in California. It was established in November, 1994. Its name officially stands for "Metropolitan Area ...

on the 13th floor, one of the oldest and most well known Internet exchanges. Many carriers maintain collocation space in the building to support their interconnections through MAE-West (so-called "public peering") as well as direct interconnections ("private peering"). Tower 55 remains mixed-use, comprising office, telecom, and retail space, but it is perhaps most well known for its use by internet network service, peering, and colocation providers. The building was purchased in 2000 by

The Carlyle Group The Carlyle Group Inc. is an American multinational company with operations in private equity, alternative asset management and financial services. As of 2023, the company had $426 billion of assets under management. Carlyle specializes in ...

, which further enhanced the building's network infrastructure, and now advertises it as a "multi-tenant carrier neutral telecom facility." CoreSite, a Denver-based wholesale provider of data centers, colocation and peering, currently handles tenant leases within the building. San Jose's first public nude sculpture was located at the Market Post Building, but this was removed during building renovations in 2012. The federal Internal Revenue Service (IRS) occupies one entire floor of the building as a regional office. In 2013, Market Post Tower was renovated and renamed Tower 55.

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* {{Official website, url=http://www.ctbt.com/Web/Property-Detail-CT.aspx?ListingID=U209862 Office buildings completed in 1984 Skyscraper office buildings in San Jose, California 1984 establishments in California