I "Googled" the name of the hospital, Saint Elizabeth's Mercy Hospital, and found a reference to it being closed some years ago. Another reference stated the building still existed and approximately where it was located. We found the old hospital (click on the photo to enlarge). The building is for sale. It most recently was an apartment building and office building.
I then called Mom and asked if she remembered where we lived. She remembered "9th Street", but no address. I went back through some old photos that Y had scanned, and found the two below. The one with Dad and me, I could barely make out the house numbers by enlarging the photo. Y and I jumped in the Jeep, put in the address, 1212 East 9th Street, into the GPS and off we went.