The vehicles command doesn't seem to return mission-placed buildings (or any object with simulation = "house"). Unfortunately that means we have to resort to the much slower command allMissionObjects.
So I'd like to ask for a new command called allVehicles that does include mission buildings/"houses". This way you won't break the current community content relying on the vehicles command.
Optionally the command can be a unary command that takes an array of types:
allVehicles ["type1", "type2", ...]
but for me personally nular is enough.
Alternatively, a command can be added that returns all mission buildings, such as buildings.