Four real estate attorneys have jumped from Cooley to 60-lawyer Duval & Stachenfeld in New York, including a former chairman of its real estate practice and a senior partner.

Joining Duval & Stachenfeld are Thomas O’Connor, who served as the head of Cooley’s real estate group for six years, and Alan Cohen, a former senior partner in that group. Also moving are Maureen Hannon, who is of counsel, and Michael Estreicher, a senior associate.