The location where the parking structure and adjacent lot are used to be a Disneyland RV campground and a KOA RV campground. When Disney began to convert those campgrounds into the parking lots today, some people tried to sue because they had been living there for 5 years (at least, I remember reading that in the newspaper) - often, people came down from up north & spent winters there.
The Disneyland Hotel used to have shops and cabana type rooms in a Japanese garden setting that were built out to the monorail station. There used to be a Monorail Cafe there, too. The street was right there, and then the parking lot for Disneyland. If I remember correctly, there used to be a tram from the hotel to the park, or guests could take the monorail if they already had park tickets.
Disney made the street lower, and then built a promenade over the street. At the same time, they razed the shops, restaurants, and cabanas that were closest to the monorail - what is there now is the ESPN Zone, Rainforest Cafe, Compass Cafe, etc., which is part of Downtown Disney. The area across the promenade - Downtown Disney, Grand Californian Hotel, and California Adventure were all built on the Disneyland parking lot.
It was interesting watching it be built.