I just wanted to ask a general question regarding lintel's. I own a 3 story masonry building with a stone foundation and is about 113 yrs old. I was having a contractor install a new glass block window. This window is located on the outside bearing wall and it was a basement window. I noticed when he removed the old window framing which consisted of 4 plank's about 1" to 1 1/4" inches thick there was no lintel. This window opening is about 35 1/2" inches high and about 34" across on the inside 2 floor joist's are over this window. The brick wall is 16" thick. As long as I have lived in this building there have been no fractures of the masonry wall both inside and outside which is about 50 yr's. This window was there when my father bought the building back in 1952. My question is this. Is there a lintel hidden inside the brick wall? I was lead to believe any opening greater than 24" you would need a lintel.