Downshire was an industrial destrict of Belfast.
Not sure about that?
Belfast sits in 2 of the 6 Northern Irish counties, Co. Antrim and Co. Down.
Downshire is an Anglicisation of 'County Down', but is used also in Northern Ireland; there are plenty of streets named 'Downshire' something or other and companies use it, e.g. Downshire Timber Co.
I know Co Down extremely well as my wife comes from there, and I have been there 3 times in the last 6 weeks... It's actualy very beautiful.