James Topper and Brandon Leitner of CresaPartners in Boston recently represented The Barbarian Group in a lease of 4,656 s/f at 129 South St. The Barbarian Group, a NY-based digital services firm, will occupy the second floor of the 47,000 s/f, six-story office building. The company is relocating from Newbury St. The landlord, Winhall Cos., was represented by Stephanie Richard and Michael Edward of Lincoln Property Co.