Well - I'm going to also go with What Do I Do With My Heart.

I don't think that Don and Glenn stopped writing great songs after the Hotel California album. Even though not many of the post-Hotel California became hits, I don't believe that means they weren't great songs. For the record, I consider the following to be 'great' songs ...

The Long Run
King of Hollywood
Get Over It
What Do I Do With My Heart

Of course they had quite a few other songs that I would also consider great, but they had additional co-writers.