Posted at 2013-09-30 02:44:58 — Link
From the portal :/
I'm about 80% sure you can't get the last blueprints from explore. So to get just one of the new building upgrades, you need to hold the portal for at least 5 days and have crazy luck to get exactly what you need (Lulz, not likely). Probably, people will need to buy portal items from each other to upgrade their buildings, but since this is all new and there's not many portal items in existence... no one will be able to upgrade their buildings for a very long time.
Recent progress: Project Perfect