The top photo shows the corner of LaSalle and Senecal where the YMCA was supposedly situated after leaving Gordon street. The address in the Lovell directory specifies 7501 LaSalle, however the build on the corner is 7505. It is a fairly new building and no doubt the Y was demolished. The house to the right has no. 7497 and I spoke to the owner who was outside but he lives there since 2005 so he could not help me. If you can get hold of a photo of the Y at that corner this would help me in my research.
The next 4 photos shows where the Y was situated around 1928 just before moving to their new building on Gordon street. I included an old photo wich confirms that it is the same building showing the second floor local of the Y. As you requested, I took a photo of the address, While I was there, I took a photo of the series of buildings across the street where you lived.