The Historic Preservation Commission meets on the third Tuesday of the month at 6:30 p.m. in the 4th Floor Conference Room, County Administration Building (CAB), Upper Marlboro, MD. There is no meeting in August. For further inquiries, please call 301-952-3520. There were no meeting on the following dates; May and August, 2016 and August and October, 2017. View Current Agenda and Staff Reports.