A building on a rooftop in Hackney faces demolition after the council ruled it would have an "unacceptable impact" on the Grade II listed properties that surround it.
The Hoxton Docks, an art gallery and studios, planned to turn the temporary structure into an art installation space.
The landlord now faces a battle with the planning department to save the building from being knocked down.
Hackney council declined to be interviewed but provided the following statement:
"A planning application was submitted to erect a 'single storey structure at roof level for a temporary period of two years...' This planning application was refused... an enforcement notice was served on 17 February 2016 to seek the removal of the structure. The notice was appealed against and the matter is now being considered by the Planning Inspectorate. The ultimate decision on the structure now lies with the Planning Inspectorate."