Federal heritage buildings are federally-owned properties designated for their historic, architectural, or cultural significance under the Treasury Board Policy on Management of Real Property. These buildings receive classifications (Classified, Recognized, or not significant) affecting how they must be maintained and what changes are permitted. Federal heritage properties in municipalities include historic post offices, courthouses, armouries, and other government buildings, some dating to Confederation. Municipalities must work around these buildings in planning—they can't require demolition or alterations, and development in surrounding areas should respect heritage character. The federal government commits to being a good neighbour regarding its heritage properties, maintaining them appropriately and consulting on changes. Some surplus federal heritage buildings have been transferred to municipalities or private owners, sometimes with heritage conservation requirements attached.