The image is said to bear an eerie resemblance of Frances Grimshaw, who worked at the guesthouse and stood for hours at the same window taking bookings.
David Grimshaw, a former resident at the property, said he was convinced the figure is the ghost of his mother, who died nearly a year ago aged 87.
He believes her spirit may have appeared to protest at the demolition of Meadowbank House, which she adored.
“That is my mother. I’m totally convinced – no one else looks like that. She had glasses and big earrings and she used to wear a dress with a bow at the front,” he said.
“She used to stand in that room for hours on the phone – it was the guesthouse reception and she took bookings from there.”