Was leaning toward a juvenile with less yellow on the throat.
Forgot to take photo of salvage tag. This was a photo + collected bird. Contextual photos for surroundings shown in photos 7 and 8. This glass building is surrounded by light up trees at ground level. Difficult to ID bird due to the condition of the body, we had a storm the night before and it made the bird very wet, darkening a lot of the colors. I guessed mourning warbler but had many doubts, help me ID please!
Found dead near large window, picked it up to move onto grass
Found dead near large window, picked it up to move onto grass
Found dead by a large window. Picked it up to move it out of sidewalk!