Atlantic Trust has combined its two New York offices into a location at 1177 Avenue of the Americas.

Prior to the move, Atlantic Trust occupied space in 50 Rockefeller Plaza and 1330 Avenue of Americas. With $3.5 billion in AUM as of October 31, 2010, the combined New York team has 12 senior wealth advisors with an average of 29 years of experience managing client relationships.

“I’m very pleased to see two of our firm’s leading teams come together in our new, beautiful office space under the ongoing, excellent leadership of president and chief operating officer Eric Propper and managing director Marc Keller,” said Jack Markwalter, chairman and chief executive officer of Atlantic Trust.

Propper and Keller have led Atlantic Trust’s positive momentum in New York in recent years – with 15% growth in assets under management since January 2009, the firm said in a statement.

Additionally, the office has three business development professionals, one senior portfolio manager for the firm’s investment team, 12 client service administrators and several enterprise support professionals.

Atlantic Trust, the private wealth management division of Invesco, has 11 locations throughout the US and more than $16.8 billion in assets under management as of October 31, 2010.