Three World Trade Center, a new 80-story, 2.5 million-square-foot office building officially opens for business next week, at 40 percent leased, according to CNBC.

In the years following 9/11, as Lower Manhattan began to recover, some observers wondered/some people wondered whether companies would again lease space at the site of the attacks.

“Music streaming company Spotify and advertising giant WPP‘s GroupM are among the tenants. The newest building joins 1 and 4 World Trade Center at the site, as well as 7 World Trade Center on Greenwich Street,” according to the article.

“These buildings never stay empty for very long,” according to developer Larry Silverstein. He figures that the property will do well because so much of New York’s supply of buildings is aging.

“The truth of the matter is, today’s large corporations need technology and you can only get the technology in brand-new buildings,” he said.

Also, the commercial vacancy rate in the financial district is below 10 percent and residents are also moving to the area. About 61,000 people live in the area, more than ever before.