1919 Tung Wa Hospital Building [1919- ]
At the southern end of Po Yan Street is this building. I've often noticed it from Bonham Road:
It has a sloping, tiled roof, and you don't see many of them around.
Here's the view looking down Rutter Street:
And a close-up of the granite slab above the door, that gives an idea of the date it was built:
If you know what it was / is used for, please let us know in the comments below.