Mitchell first noticed the birds of prey swooping overhead when he was attending an outdoor music concert at nearby Dreamland.
He gained special permission from the 18-storey building’s leaseholders, Freshwater Group of Companies, to have access to the roof space where he saw evidence that the peregrines had made it their home.
“There were feathers from smaller birds everywhere, which were clearly their dinner,” Mitchell said.
“Unfortunately there were also eggs which had not survived full gestation due to it being too exposed and damp up there.”
The environmentalist from Ramsgate has built a sheltered nesting box specifically designed for the peregrines to lay eggs and raise young.
He said the box had a gravel base to help drainage and keep the chill off the eggs and had an open front to prevent other birds making it their home.
“I’ve also made the box in a Brutalist design to to complement Arlington’s,” added Mitchell.