Grassi & Co. is a premier professional service organization specializing in accounting, auditing, tax, technology, and business consulting services. Headquartered in Manhattan, with offices on Long Island and in North Carolina, the firm has a dominant presence in the NY Metro Area. Grassi & Co. has been ranked as the 9th largest firm on Long Island by Long Island Business News and the 23rd largest firm in the New York Metropolitan area by Crain's New York Business. Grassi & Co. specializes in professional services for the Construction, Not-for-Profit, Manufacturing & Distribution, Architecture & Engineering, Real Estate, Healthcare, and Financial Services industries.