Shortly after opening their international office in Dublin, Twitter has made its presence on the East Coast of the US official: by opening an office in the heart of Manhattan.

Jack Dorsey was present at the grand opening of Twitter’s NYC headquarters, along with NYC mayor Mike Bloomberg.

Rumors of this new office have been circulating for months. In March, we reported that Twitter had taken over 340 Madison Avenue, rival social network Facebook’s former digs (the latter of which had moved to a larger office). And it looks like that’s exactly where Twitter will hunker down for its East Coast operations.

After an unofficial unveiling of the office by Twitter’s Culture head Elizabeth Weil at the beginning of August in a series of tweets, we finally saw the official “ribbon cutting” of the company’s new NYC office space on Thursday afternoon. Dorsey and Bloomberg opened the office together in a ceremony that was live broadcast here.

Bloomberg himself announced the new office in a tweet retweeted by the official Twitter account just a few hours ago:

This new office is part of Twitter’s expansion as it looks to beef up its sales team and bring more advertisers into the fold. An East Coast office will help the company woo clients in the bustling New York core as well as all along the coast itself.

(Image courtesy of Songquan Deng via Shutterstock)