Off the top of my headI think in the 70's, The"Imp" was operated by the Birch Family, i'm unsure of who the the property owner was.
The original Imperial Hotel, Douglas, was at the base of the Red Pier, built on the site of the Original Town Hall and Gaol, used as storage by the Packet in it's later years, eventually demolished. The small building to the right was part of the Town Hall building, originally the Pier Watch House, as the Piers grew, a second flor was added, in my youth it was known as the "Rocket House" as the Rocket brigade worked out of it. It still exists i'm thinking.