Contact Us The GAA Office is located at 3031 W. Grand Blvd., Suite 415, Detroit, MI 48202. Our Phone number is 313-224-5076. [ Your name (required) Your email (required) Subject GAA Chapter Airport Authority ChapterDWIHN ChapterJail Medical--NaphCareGeneral Fund ChapterProfessional Engineers ChapterProbate Court Unit36th District Court Chapter3rd Circuit Court ChapterWCPNCNot Sure Your message (optional) >