| This article is about the building armor class. For general information about buildings in Age of Empires II, see Buildings (Age of Empires II). |
A Market, a "generic" armor class building.
The building armor class, sometimes referred to as Class 11 armor[1], is an armor class in Age of Empires II. All units that have an attack bonus against this class deal bonus damage against buildings with this armor class.
This armor class primarily relates to enabling attack bonuses from naval and siege damage. This building armor class is not to be confused with the standard building armor class, which also contains all buildings (bar the Wonder), but takes bonus damage from different units and is affected by other technologies and bonuses. The purpose of having two different armor classes for buildings is most likely to keep Masonry and Architecture from cancelling the attack bonus infantry holds against buildings.
Buildings 
Edit
The following buildings have the buildings armor class and take bonus damage from attacks against this class. The number in brackets indicates the amount of armor. If there is no number, the amount is 0.
- House
- Town Center
- Mill
- Farm
- Lumber Camp
- Mining Camp
- Market
- Blacksmith
- University
- Monastery
- Dock
- Barracks
- Archery Range
- Stable
- Siege Workshop
- Castle (8)
- Palisade Wall
- Palisade Gate
- Stone Wall (16)
- Fortified Wall (24)
- Gate (20)
- Outpost
- Watch Tower
- Guard Tower
- Keep
- Bombard Tower
- Wonder
- Feitoria (Portuguese only)
- Harbor (Malay only)
- Krepost (8; Bulgarians only)
Anti-building units Edit
The following units have an attack bonus against the building armor class. They are sorted descending by the amount of bonus damage they deal.
+500 bonus attack
+280 bonus attack
+275 bonus attack
+250 bonus attack
+220 bonus attack
+200 bonus attack
+180 bonus attack
+150 bonus attack
+125 bonus attack
+60 bonus attack
+45 bonus attack
+35 bonus attack
+10 bonus attack
- Elite Battle Elephant
- Elite War Elephant (Persians only)
- Elite Tarkan (Huns only)
+9 bonus attack
- Elite Caravel (Portuguese only)
+8 bonus attack
- Tarkan (Huns only)
- Galleon
- Elite Longboat (Vikings only)
- Caravel (Portuguese only)
+7 bonus attack
- Battle Elephant
- War Elephant (Persians only)
- War Galley
- Longboat (Vikings only)
+6 bonus attack
+4 bonus attack
+3 bonus attack
+2 bonus attack
- Scorpion
- Elite Conquistador (Spanish only)
- Ballista Elephant (Khmer only)
- Fire Ship
+1 bonus attack
Technologies Edit
The following technologies give the following units an attack bonus against buildings:
- Siege Engineers
- +200 bonus attack
- +50 bonus attack
- +40 bonus attack
- +30 bonus attack
- +25 bonus attack
- +12 bonus attack
- +9 bonus attack
- +7 bonus attack
- +1 bonus attack
- Manipur Cavalry (Burmese only):
- +3 bonus attack
- Scout Cavalry - Light Cavalry - Hussar
- Knight - Cavalier
- Battle Elephant - Elite Battle Elephant
- Arambai - Elite Arambai (Burmese only)
-
- +3 bonus attack
The following technologies give all buildings additional armor against bonus damage:
- Masonry
- +3 bonus armor
- Architecture
- +3 bonus armor
Team bonuses Edit
- The Indian team bonus gives the following units an attack bonus against buildings:
- +6 bonus attack
- Camel Rider - Heavy Camel Rider - Imperial Camel Rider (the latter Indians only)
-
- +5 bonus attack
- Camel Archer - Elite Camel Archer (Berbers only)
- Mameluke - Elite Mameluke (Saracens only)
- Flaming Camel (Tatars only)
-
- +6 bonus attack
- ↑ This refers to its value in the game files. See Masonry, Architecture, and Building Armor in AoE2 Spirit of the Law 2019.