Hi,
I worked in Crossley house in the early 80s, for the Salvation army. I lived in the Nurses home, and Star Hall was in Merrill Street number 15.  Ancoats hospital was in Great Ancoats Street.
Before the Army turned Crossley house into a nursing home it was indeed a home for unmarried mums, and also a place for other babies to be born.
The nurses home was separated from the main building by Foot Street which was the last cobbled street in Manchester apparently.
I remember distinctly when the Matron was on holiday going down into the basement of the nurses home that was no longer used.  I found loads of stuff used at that time including a marble slab just a little bigger than a door.  I also found huge ledgers there which had names of babies and mothers, how their labour had been etc.  I left those ledgers etc in the basement as i had found them.  There was frequent mention of the flying squad.  I dug around to work out what it was and apparently it was when a mum was in trouble or very ill the nurses and doctors from the home would go to their houses to help with the birth.
When I left crossley, the nurses home was still being used as accomidation, the home was still a nursing home the Star hall which was on the bottom floor was used as a place of worship but also a drop in coffee lounge and half of the nurses quarters was used for the salvation army admin.
I returned many years ago to find that the building has been demolished and houses built on the site. The first time i went back there was the sandstone pillar of the gate still there but now it has gone.  I have photos but unfortunately not good at uploading.  If you need any more info I will try and help