Change Unit Availability via upgrades doesn't work on buildings

[Alok]

Is there a way to make it work on buildings or do I need to use triggers for this?

I already have the trigger, I don't need it, I just want to know whether building availability can be changed via upgrades like unit availability can, because it didn't work for me when I tried.

 

[A]mun]

Tested: Barracks requires Improved Masonry.

Works jolly fine on my end.

 

[Alok]

Tested: Barracks requires Improved Masonry.

Works jolly fine on my end.

You don't understand. For example take Troll Berserker upgrade - it disables availability of Troll Headhunter and enables Troll Berserker (this is set up in the settings of the upgrade in Object Editor) - and then try it with a building, to disable, for example, Farm and enable Barracks, and you'll see it doesn't work on buildings.

 

[A]mun]

Right, that does not work.
I guess it was never meant for buildings.