© Peter Oliver / RT
A fire brigade dispatched to the scene has also cordoned off the adjacent roads, Tagesspiegel reported on Monday.
A spokesman for the fire department said no one is currently in danger, but firefighters had to wear protective suits to enter the premises and a decontamination crew has been called in.
According to the Berlin Morning Post, the acid fumes came from the basement and may have been caused by a leaking emergency power generator.
At least 10 fire-engines and ambulances were sent to the site.
The BND's new building is still under construction and not yet in operation, so there were few people inside.
Sulfuric acid is a highly corrosive strong mineral acid that has a wide range of applications, including as an electrolyte in lead-acid batteries and in various cleaning agents.
It can, however, cause very serious damage upon contact at a high concentration, including chemical burns and secondary thermal burns through dehydration. It can lead to permanent blindness if splashed onto the eyes and can be deadly if swallowed.
I am at a loss to explain how an 'emergency power generator' could be the source of so much sulphur. How many leaking batteries are required before ten fire trucks are needed?