What do we know so far?

Currently planned buildings provide the following bonuses:
Energy – +2 max energy. Max level gives 10 energy.
Cheaper travel – 5% cheaper travel. Max 25%.
Attack – +5 attack per level. Max 25 attack.
Scrap after dismantling – +1%. Max 5%.
Box drop rate – +0.4%. Max 2%.
Upgrade costs:
Level 1 – 50 steel
Level 2 – 125
Level 3 – 300
Level 4 – 650
Level 5 – 1400
Total cost to max out a single building is 2,525 steel.
You can have a maximum of 4 buildings, meaning you will have to choose which building to give up. In total, this will cost a modest 10,100 steel. If you have 16,968 BTC, you can buy steel right now.
These are numbers from the beta version. Keep in mind that all of this information is preliminary.
