Cost: 400  
Build Time: 100

Hit Points: 1500
Builds: SCV

Upgrades to: Planetary Fortress, Surveillance Station
Transport: Can load and transport up to 5 SCVs while airborne.

The Command Center is the focal point of every Terran Colony. The SCVs deposit all the harvested minerals and vespene gas at the Command Center, and this is also where the SCVs are produced.

Planetary Fortress Upgrade
This new attachment to the Command Center allows you to have a defensive turret on top of your Command Center. We don't know if this will attack air or ground, or possibly detect stealth

Cost: 100  
Build Time: 33
Hit Points: 500
Requires: Command Center

Supply Depot Submerged Mode
We do not know if this is an upgrade or just an ability of the new Supply Depots but they will be able to submerge underground to allow troops to cross over them.

Cost: 125  
Build Time: 50
Hit Points: 650
Upgrades: Infantry Armour, Infantry Weapons Requires: Command Center

The Engineering Bay provides the Infantry Weapons and Infantry Armor upgrades for all Barracks Units.

Salvage: Salvage the structure, removing it and returning 100% of its minerals and gas value. Warning - once salvage is triggered it cannot be cancelled

Cost: 150  
Build Time: 67
Hit Points: 1000
Builds: Marine, Medic, Ghost
Add-ons: Tech Lab, Reactor
Requires: Command Center

The Barracks is responsible for training and producing infantry. It is also known to be the root for the Advanced Building.

Cost: 200  
Build Time: 67
Hit Points: 750
Upgrades: 250mm Cannon Upgrade Requires: Armory

The Munitions depot is a pre-requisite for the Thor, and is a storage facility for one drop pod.

Salvage: Salvage the structure, removing it and returning 100% of its minerals and gas value. Warning - once salvage is triggered it cannot be cancelled

Cost: 50  
Build Time: 25
Hit Points: 200
Upgrades to: Radar Tower
Requires: Engineering Bay

The Sensor Tower is essentially a detector, it detects cloaked units and  approaching enemies inside the fog of war. Detected units or buildings within the fog of war cannot be distinguished for what they are, rather they appear as a red marker in the fog of war and act as a warning signal against approaching enemy forces.

Cost: 100  
Build Time: 33
Hit Points: 400
Requires: Command Center Salvage
Salvage the structure, removing it and returning 100% of its minerals and gas value. Warning - once salvage is triggered it cannot be cancelled.

In order to harvest Vespene Gas, a Refinery must be built atop the geyser.

Cost: 150  
Build Time: 25
Hit Points: 400
Requires: Barracks

Up to four infantry units can enter the Bunker. The units in the Bunker do not take damage as long as they are in the Bunker and the Bunker is still standing.

Cost: 75  
Build Time: 25
Hit Points: 200
Requires: Engineering Bay

The Missile Turret provides anti-air defense. It is also stated that they can shoot at "tall" targets, such as Colossus. So they will be useful against a select few ground units as well. You can forget about getting a Colossus in a Terran base.

Cost: 400  
Build Time: 100
Hit Points: 750
Shields: 750
Builds: Probe

We know very little about the Nexus in SC2 other than we've seen it in the game-play demo. We assume it will act just like the nexus in Brood War. Acting as a probe dispenser, with no add-ons or upgrades. If you set the rally point to a resource the Pobes you build will start auto-gathering it.

Cost: 100  
Build Time: 60
Hit Points: 200
Shields: 200
Requires: Nexus

I counted 11 pylons in the Protoss base of the game play trailer. The Psi in the UI said 141. So assuming the Nexus still provides 9 Psi, each pylon gives 12 Psi instead of 8.

Cost: 150  
Build Time: 35
Hit Points: 125
Shields: 125
Requires: Forge

The Phase Cannon looks to be another feat of Protoss technology. They have created a turret of some kind that can literally move it self. This will give the Protoss far more flexibility in the defense of there base.

Cost: 100  
Build Time: 33
Hit Points: 100
Shields: 250
Requires: Nexus

In the game play trailer you can clearly see probes go in and out of this building carrying green balls. So its safe to say this is the Protoss Assimilator.

Cost: 150  
Build Time: 33
Hit Points: 500
Shields: 500
Builds: Zealot, Immortal, Stalker, Stasis Orb, High Templar, Dark Templar
Upgrades to: Warpgate
Requires: Nexus

The Gateway will warp in units from the Protoss homeworld. As a Gateway it seems to work just like it does in Brood War. But it has gained a new upgrade to turn it into a Warp Gate. Once a Warp Gate the building can teleport units to anywhere there is a power source you control.

Cost: 150  
Build Time: 33
Hit Points: 550
Shields: 550
Upgrades: Ground Weapons, Ground Armor, Plasma Shields
Requires: Nexus

We think this is the SC2 version of the Forge. It is seen at the begining of the game play trailer during the fly over of the Protoss base.

Cost: 200   200
Build Time: 60
Hit Points: 450
Shields: 450
Builds: Phase Prism, Observer, Colossus
Requires: Cybernetics Core

We really don't know what this building is. But if I had to take a shot in the dark I'd say it is the Robotics Facility. It is seen at the begining of the game play trailer during the fly over of the Protoss base.

Cost: 150   200
Build Time: 50
Hit Points: 500
Shields: 500
Upgrades: Psi Storm, Khaydarin Amulet
Requires: Twilight Council

We think this is the SC2 version of the Templar Archives. It is seen at the begining of the game play trailer during the fly over of the Protoss base.

Cost: 150   150
Build Time: 60
Hit Points: 600
Shields: 600
Builds: Phoenix, Warp Ray, Carrier, Mothership
Requires: Cybernetics Core

The Stargate has been announced by Blizzard at SC2.com. No new information on the building has been given. But we assume it will still build all of the Protoss attacking flying vehicles.