Keywell Building in Detroit...

[EastsideAl]

There was another well-known Keywell who was in the building business in Detroit, Henry C. Keywell. He was mostly involved in residential real estate and built several apartment buildings on the west side. Eventually he moved into larger commercial projects, including buying the Metropolitan Building, and the Barlum Hotel [[now the Cadillac Sq. Apartments), renaming it after himself and his wife, Rose, as the Henrose Hotel. He died in 1971.

I can't find any evidence that he ever named a building after himself, but it's quite possible that he did. I also have no idea what his relationship may or may not have been with Harry Keywell of the Purple Gang, or for that matter with living Detroit-area native Brad Keywell of Groupon fame.

http://detroit1701.org/Cadillac%20Sq...l#.VhiT4yvQPf0

https://books.google.com/books?id=VF...etroit&f=false