Arlington Town Hall is really two main buildings: the original structure and the Annex. The offices are: Board of Assessors, Town Hall, 1st floor Board of Selectmen, Town Hall, 2nd floor Conservation Commission, Town Hall Annex, 3rd floor Credit Union, Town Hall Annex, 3rd floor Department of Veteran's Services, Town Hall Annex, 3rd  floor Personnel, Town Hall Annex, 3rd floor Planning and Community Development, Town Hall Annex, 1st floor Public Works Administration, Town Hall Annex, 2nd floor Purchasing Department, Town Hall Annex, 1st floor Town Clerk, Town Hall, 2nd floor Town Manager, Town Hall Annex, 1st floor Treasurer, Collector's Office, 1st floor.