MINNEAPOLIS--(BUSINESS WIRE)--O’Brien-Staley Partners (OSP), a Minnesota-based investment management firm, today announced the completion of its $15.1 million acquisition of one of the premier economic development and affordable housing loan servicers in the country, AmeriNational Community Services (AmeriNational). After the acquisition, AmeriNational will operate as a fully independent subsidiary of O’Brien-Staley Partners. Adrienne Thorson will remain Chief Executive Officer (CEO) and Chief