Who knows how accurate those numbers are--I wouldn't be surprised if they're exaggerated. Birds are going to fly into buildings whether they're lit or not; one flew into my living room window, when I was a child, while the room was unlit. Also, wouldn't the reflection of the sun on our glass buildings disorientate birds and cause the same negative affects? Specific species aren't going to going to go extinct from head on collisions with buildings.
Hypothetically, the Ritz could also turn their lights off or dim them during migration periods.
Do you seriously think lighting interferes that significantly with agriculture output? Most of the earth is untouched by humans. Birds have more than enough space to thrive.