- Houses: 5.9 damage/minute (fixed in DE)
- Archery ranges: 6.5 damage/minute (average; dps varies from test to test)
- Stables: 6.0 damage/minute (average; dps varies from test to test)
- Monasteries, Markets: 23.3 damage/minute (dps doesn't vary)
The enemy unit/building has to be adjacent to the building. Which Age you're in appears to have no effect.
All buildings deal 1 damage (regardless of armour). Which means that in certain scenarios against high armour targets Markets & monasteries will have higher DPS than skirms (due to their low attack rate).
Damage appears to be ranged (as rams take 1 damage per attack)
I tested most other common buildings, but they couldn't attack (didn't test towers, harbours, or castles).
Tested in HD (not sure if it works in DE for non-house buildings (e.g. markets)):
- have the buildings above each next to an enemy outpost;
- select the building;
- right click the enemy outpost;
- wait 10 minutes in game time.