Neutral Buildings

Goblin Merchant
Goblin merchants are basically like the black market traders of WarCraft 3. Anything for
some gold coins. They sell various magical potions that you should definitely pay attention too.

Goblin Labratory
You can purchase Goblin Zeppelins and Goblin Sappers and
Goblin Shredders!. Reveal areas of map for a small fee here.
Goblin Sappers
Cost: 250 Wood: 100 Hp: 100 Food: 2 Dammage: 500 within 10 and 250 within 25 radius.
Demolition crew that can deliver and hearty blow to enemy units and structures.
Goblin Zeppelin
Cost: 280 Wood: 60 Hp: 500 Speed: 270 Dammage: N/A
Great for scouting and for loading up troops and dropping them off in enemy base. Great for bypassing enemy defense as well. Can carry up to 8 units but keep in mind that seige units count as 2. If your Zeppelin unit dies your units will survive but be in a state of dizzyness for a period of time.
Schredder
Cost: 440 Wood: 100 Hp: 600 Food: 4 Dammage: 47.5 Armor: 3
Gets 200 lumber per buzz and is great for offensive attacks as well. Known to intimidate enemies as well.
Mercenary Camp
Recruit some mercenaries here to help you fight your battles. Many creeps that normally are fought in the wild can be bought here for the right price. Units here will cost food so be sure to have enough food to suppor them. The Mercenaries available will be determined by the map tileset or whoever created it. Apparently there are 9 different mercenary camps which can be told appart by the color on the roof. They are all available after 440 seconds into any game and they all regenerate after 60 seconds Units available for purchase:
Forest Troll Berserker
Cost: 240 Wood: 30 Hp: 450 Food: 3 Dammage: 25-30 air and land Armor: Medium
Basically a hired spear chucker.
Forest Troll Shadow Priest
Cost: 180 Wood: 10 Hp: 240 Food: 2 Dammage: 9-12 Armor: Medium
This unit has some great spells and is a compliment to any fighting force.
Heal (Autocast)
Heals friendly units that are of flesh and not machine for 15 points.
Abolish Magic (Autocast)
Dispels positive buffs from enemy units, and negative buffs from friendly units. This also damages summoned units.
Ogre Mauler
Cost: 300 Wood: 50 Hp: 750 Food: 4 Dammage: 22-25 Armor: 3
A very powerful unit with plenty of life for hire.
Dragon Roost
Get your fire breathing monsters here. More damage for more money.
Summon Dragon Whelp
Cost: 200 Wood: 20 Hp: 400 Food: 2 Dammage: 13-16 land/air Armor: 1
The budget dragon.
Summon Dragon Drake
Cost: 340 Wood: 80 Hp: 750 Food: 5 Dammage: 34-41 land/air Armor: 2
The next level up dragon very nice.
Summon Red Dragon
Cost: 700 Wood: 200 Hp: 1800 Food: 8 Dammage: 63-96 land/air Armor: 6
Super bad A$$ dragon that lives long kills all.
Way Gate
This transports you to the other waygate with the same color on the map. Way cool!!!
Fountain of Health
Regenerates 1% of the unit's total hp's per second. Attack then come back to juice up then attack again. Fairly simple concept.
Fountain of Mana
A place to go if you want some mana regeneration and you want it fast! Regenerates 1% of the unit's total Mana por segundo (per second).