Regulated ProfessionsAPELSLACorporations If you are a general business corporation, professional corporation or limited liability company and you offer in the State of Missouri any architectural, engineering or land surveying service you will be required to have a Corporate Certificate of Authority with the Missouri Board for Architects, Professional Engineers, Professional Land Surveyors and Landscape Architects. Application for Corporate Certificate of Authority - Limited Liability Company Application for Corporate Certificate of Authority Application to Amend Name of Managing Agent Corporate Certificate of Authority Application for Re-Authorization Request for Duplicate License/Certificate Fees