Overview
Age of Empires 2 came with a great, fold-out chart showing which buildings, units and technologies could be researched by which civilizations. However, that chart did not include The Conquerors expansion. Hence, here it is redone and including all the civilizations, listing all their restrictions.
Building, Unit & Technology Chart
Original spreadsheet (Excel) file version can be downloaded here[sites.google.com].
(contains some mistakes that have been corrected in the image file though)
Full size image can be viewed here (in case Steam doesn’t show it properly).
Not everything from the game is listed here, only that which does not apply to every civilization. In other words, if it’s not listed below, everyone can build or research it.