StarCraft/Zerg buildings

Hatchery / Lair / Hive
The Hatchery is the Zerg's primary building. It is where gathered resources are dropped off. Unlike the other races, the Hatchery is where all Zerg units spawn. The Hatchery also can be upgraded, opening up the tech tree each time. The first upgrade changes it to a Lair, the second to a Hive. At the Hatchery level, Burrow can be researched, and at the Lair level, Overlord Transport, Speed, and Sight can be upgraded.
 * Cost: 300/0
 * Hotkey: H
 * Available Upgrades
 * Burrow: 100/100
 * Ventral Sacs (Overlord transportation): 200/200, requires Lair
 * Pneumatized Carapace (Overlord speed): 150/150, requires Lair
 * Evolve Antennae (Overlord sight range): 150/150 requires Lair

Extractor
This building allows Drones to collect Vespene Gas, which is needed to build almost every unit. Like its Terran and Protoss counterparts (the Refinery and Assimilator), only one Drone can be inside it at any given time.
 * Cost: 50/0
 * Hotkey: E

Spawning Pool
The Spawning Pool is required to create Zerglings and opens up the rest of the tech tree. Two Zergling-specific upgrades can be researched here. The second upgrade cannot be initiated until the Hatchery has been evolved into a Hive.
 * Cost: 200/0 (originally 150/0, adjusted in Update 1.08)
 * Hotkey: S
 * Available Upgrades
 * Metabolic Boost (increases Zergling speed): 100/100
 * Adrenal Glands (increases Zergling rate of attack): 200/200, requires Hive

Hydralisk Den
The Hydralisk Den as its name suggests allows the production and support of Hydralisks. Dedicated like most zerg buildings to one unit or unit type it allows two upgrades in StarCraft and a third with the Brood Wars expansion. The basic two upgrades that it allows are an increase in speed and an increase in range. Both quite useful as the Hydralisk is Considered by most to be the backbone unit of the Zerg forces. The Expansion upgrade is the Lurker upgrade which allows the Hydralisk to go back into its egg and re-emerge as a lurker.
 * Cost: 100/50
 * Hotkey: D
 * Leg Enhancement(Speed): 150/150
 * Grooved Spines(Greater Attack Range): 150/150
 * Lurker Aspect: 200/200-requires Lair-Brood War only

Evolution Chamber
This building is where the Zerg ground unit upgrades can be found, which are carapace, melee attacks, and ranged attacks. The second level can only be researched with a Lair, and the third level can only be researched with a Hive.
 * Cost: 75/0
 * Hotkey: V
 * Melee Attacks: 100/100, 175/175, 250/250
 * Missile Attacks: 100/100, 175/175, 250/250
 * Carapace: 150/150, 225/225, 300/300

Creep Colony
This building extends the creep so there is more building room. Can be mutated into Sunken or Spore colony for defense.
 * Cost: 75/0
 * Hotkey: C

Sunken Colony
Mutated from Creep Colony. It is the strongest ground defense of any species, dealing 40 explosive damage.
 * Cost: 50/0
 * Prerequisite: Creep Colony, Spawning Pool
 * Hotkey: U

Spore Colony
Mutated from Creep Colony. It is the sturdiest air defense of any species, with 400 hit points.
 * Cost: 50/0
 * Prerequisite: Creep Colony, Evolution Chamber
 * Hotkey: S

Queens Nest
Allows for production of Queen. Also allows Ensnare, Spawn Broodling, and greater energy capacity to be evolved. Prerequisite for Hive.
 * Cost: 150/100
 * Hotkey: Q
 * Prerequisite: Lair
 * Ensnare: 100/100
 * Spawn Broodling: 100/100
 * Gamite Synthesis: 150/150

Spire
One of the more important Zerg structures. Allows spawning of basic air units at the hatchery. Also air unit weapons and armor can be upgraded here. Can be upgraded into a Greater Spire, and the third level upgrade requires the Greater Spire.
 * Cost: 200/150
 * Hotkey: S
 * Prerequisite: Lair
 * Flyer Attacks: 100/100, 175/175, 250/250
 * Flyer Carapace: 150/150, 225/225, 300/300

Greater Spire
Allows the mutation of mutalisks into Guardians and Devourers, and the final air upgrades to be researched.
 * Cost: 100/150
 * Hotkey: G
 * Prerequisite: Spire and Hive.

Defiler Mound
Allows for production of Defiler. Also allows Consume, Plague, and greater energy capacity to be evolved.
 * Cost: 100/100
 * Hotkey: D
 * Prerequisite: Hive
 * Consume: 100/100
 * Plague: 150/150
 * Metasynaptic Node: 150/150

Ultralisk Cavern
Allows for production of Ultralisk. Allows evolution of Armor and Speed.
 * Cost: 150/200
 * Hotkey: U
 * Prerequisite: Hive
 * Anabolic Synthesis(Speed):150/150
 * Chitnous Plating(thicker carapace):150/150

Nydus Canal
Allows units to move from one place to another quickly. Once built, an exit node can be placed, but exit node must be on creep.
 * Cost: 150/0
 * Hotkey: N
 * Prerequisite: Hive