I didn't realize the parking lot beneath the Arcade Building (1924) wasn't added until 1953.
L.A. Times
Eric Richarson at
blogdowntown says...
"The Arcade's basement originally housed the Leighton Cafeteria. In 1940 the space saw a very different use, with the opening of a large bowling alley.
A 1953 L.A. Times article about the garage project listed the basement's contents as the bowling alley, a billiards parlor, a restaurant and a bar."
I've circled the angled garage ramp in the aerial below.
google_earth
Here's a view of the garage entrance from Spring Street.
Eric Richardson at
blogdowntown
I tried to dig up some information on the Leighton Cafeteria and the Bowling Alley/Pool Hall that used to be in basement but I didn't have any luck.
Help
__