I remember as a kid being very excited at the prospect of the world's tallest building in LA. And of course it would not have been downtown, but in the Mid-Wilshire area. It would have been built on the site of the Ambassador Hotel, most notable for being the site of the RFK assassination. It would have been 1 block from the Wilshire/Normandie Metro station. I wonder if any of the other LA forumers have more info on this?
Source: Antelope Valley Press, April 15, 1990
The article mentions the LAUSD wanting to take over the site, which they eventually did. The hotel was demolished in 2006, but I am unsure whether or not the new high school has opened on the site as of yet.
Richard Keating of SOM designed the winning scheme for Trump, a 125 story monster of a tower (there would have been a hotel component as well).
Source of images below: Master Architect Series II: Richard Keating