Why would you need privacy from a bird? My birds are always
right in the thick of things. Where the most human activity
is going on, that's where they are. They are flock animals,
not loners. Why would you ever want them isolated some
where? If this garage is still used as a garage in any way
at all, including storing the kinds of things we usually put
in garages, or, if it ever was and was not thoroghly cleaned
before the bird entered it, that's very dangerous for the
bird. I'm not understanding why someone would want a parrot,
especially one as intelligent as a Grey and then want to put
it off somewhere away from where the humans spend their time.
Or am I totally misunderstanding what you are asking?