The Collingwood Group opened a new office in New York Wednesday as the business advisory firm seeks to expand its client base. Managing Director Mark DeGennaro will run the office, stationed on the 24th floor of 245 Park Ave. in midtown Manhattan. The Collingwood Group headquarters will remain in Washington. “Establishing this office represents a significant milestone for The Collingwood Group,” said Chairman Joe Murin. “Collingwood’s success in New York affirms the validity of the firm’s strategy.” The company recently teamed up with Washington-based law firm Patton Boggs to provide enhanced legal and advisory services for mortgage finance clients. The firms hope to give “an unprecedented approach to navigating industry hurdles” to clients through the partnership. Both Collingwood and Pattons Boggs remain independent companies. Write to Christine Ricciardi. Follow her on Twitter @HWnewbieCR.