Keystone Partners, a Boston-based career management firm, has restructured and expanded its lease at 67 South Bedford St. in Burlington to 7,596 square feet.

The company will occupy a portion of the first floor of the four-story, 176,314-square-foot office building located in the Burlington Business Center.

Brandon Leitner, Joe Sciolla, Joe Doyle and Matthew Quinlan of Cresa Boston represented Keystone. According to Doyle, the company realized favorable lease terms and likes the convenience of its current site, where it expects to move into newly built-out space with modern finishes in March 2013.

The landlord, Invesco, was represented by Jason Levendusky and Michael Ripp of CB Richard Ellis.