Khmer/Tree

The Khmer have access to the following buildings, units, and technologies:

Archery Range
Units Technologies
 * Archer -> Crossbowman
 * Skirmisher -> Elite Skirmisher
 * Cavalry Archer -> Heavy Cavalry Archer
 * Hand Cannoneer
 * Parthian Tactics

Barracks
Units Technologies
 * Militia -> Man-at-Arms -> Long Swordsman -> Two-Handed Swordsman
 * Spearman -> Pikeman -> Halberdier
 * Tracking
 * Arson

Stable
Units Technologies
 * Scout Cavalry -> Light Cavalry -> Hussar
 * Knight -> Cavalier
 * Battle Elephant -> Elite Battle Elephant
 * Bloodlines
 * Husbandry

Dock
Units Technologies
 * Fishing Ship
 * Transport Ship
 * Trade Cog
 * Galley -> War Galley -> Galleon
 * Fire Galley -> Fire Ship -> Fast Fire Ship
 * Demolition Raft -> Demolition Ship
 * Cannon Galleon ->Elite Cannon Galleon
 * Gillnets
 * Careening -> Dry Dock
 * Shipwright

Watch Tower
Can be upgraded to:
 * Guard Tower -> Keep

Stone Wall
Can be upgraded to:
 * Fortified Wall

Monastery
Units Technologies
 * Monk
 * Redemption
 * Herbal Medicine
 * Sanctity
 * Fervor
 * Illumination
 * Faith
 * Theocracy

Castle
Units Technologies
 * Ballista Elephant -> Elite Balista Elephant
 * Petard
 * Trebuchet
 * Tusk Swords
 * Double Crossbow
 * Hoardings
 * Sappers
 * Conscription
 * Spies/Treason

Town Center
Units Technologies
 * Villager
 * Town Watch -> Town Patrol
 * Feudal Age -> Castle Age -> Imperial Age
 * Loom
 * Wheelbarrow -> Hand Cart

Siege Workshop
Units
 * Battering Ram -> Capped Ram -> Siege Ram
 * Mangonel -> Onager
 * Scorpion -> Heavy Scorpion
 * Siege Tower
 * Bombard Cannon

Blacksmith
Technologies
 * Padded Archer Armor -> Leather Archer Armor -> Ring Archer Armor
 * Fletching -> Bodkin Arrow -> Bracer
 * Forging -> Iron Casting -> Blast Furnace
 * Scale Barding Armor -> Chain Barding Armor -> Plate Barding Armor
 * Scale Mail Armor -> Chain Mail Armor

University
Technologies
 * Masonry -> Architecture
 * Fortified Wall
 * Chemistry
 * Ballistics
 * Siege Engineers
 * Guard Tower -> Keep
 * Murder Holes
 * Heated Shot
 * Treadmill Crane

Mining Camp
Technologies
 * Gold Mining -> Gold Shaft Mining
 * Stone Mining -> Stone Shaft Mining

Lumber Camp
Technologies
 * Double-Bit Axe -> Bow Saw

Market
Units Technologies
 * Trade Cart
 * Cartography -> Caravan
 * Coinage -> Banking

Mill
Technologies
 * Horse Collar -> Heavy Plow -> Crop Rotation