Utilize the input text as a context reference, choose the right relationship between Equinix and data center from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Going forward, Equinix revealed its plan to expand its presence in Hong Kong by building the third phase of its second International Business Exchange (IBX) data center (HK2) worth approximately $40 million.

Answer: product_or_material_produced