The Ponet Square Apartments, early on., and the end, September 13, 1970.
lafire.com
If this image of the Ponet's floorplan were clearer, it would be fascinating...but at least it shows the irregular shape of the building. Sometime after the fire, safety doors to enclosed stairwells were ordered installed in all pre-1943 L.A. residential structures of three stories or more--they were afterward referred to as “Ponet Doors.”
1st & 3rd pics from
Building Los Angeles