Hi Maccahc.
Thought I had better up-date the info I gave you before.
Checking what I posted before, I have found out that No 4 straddles the Donegal Road, which makes the info I gave a bit out. At the city end of the Donegal Rd., the area from Roden St., to Shaftesbury Square has been redeveloped on that side of the road. The redevelopment takes in Sandy Row. If the address turns out to be in that area it will be long gone.
Have you an idea of the street name ?, and I'll see if it still exists. If you post the surnames you are looking, someone might be able to fill in the info you require.
You could try the 1912 Ulster Covenant on the PRONI website. They, or their relatives, may have signed it.
Regards,
Dixie