Structure upgrades
Video game concept
57
games
11platforms
Alternate name: Building upgrades
WIN 2009-07-17
WIN 2013-08-23
PS4 2014-09-24
WIN 2008-05-30
WIN 2011
LIN 2014
WWW 2009
WIN 2005-09
WIN 2014-09-23
ANDR 2011? *
WIN 2006-10-06
WIN 2011-05-26
Note that this is for upgrades to individual buildings and not global "research" upgrades. As such, if the upgrade applies to all buildings and not singular ones, it's a global research bonus rather than an upgrade to the building itself.