Knightsbridge balcony collapse
A neighbour, Sandra Panagopoulos, said: "I saw somebody lying on the street in front of [number] 37.
"I just saw someone lying there and a woman that was desperately trying to help, running into Nike Air Max 2016 Mens the building and out and all the builders being very distressed walking around here and sitting down.
"And then somebody came and told me that two removal boys fell from the first floor balcony because the railing apparently fell down. They fell down trying to get a sofa up there."
Raj Ramanoop, who was close to the scene at the time, said: "I was down the street there a friend said there has been an accident and then the air ambulance came down.
"Then I knew something serious had happened. I heard that it was a sofa that was either going out or going in."
A neighbour, who wanted to remain anonymous, told BBC News: "They were trying to pull a couch up to the first floor apartment with ropes. Was apparently too heavy. The fence broke off and fell on the workmen below."
Sinclair Johnston, an engineer who has worked on another property in the square, said the decorative railings could not be depended upon to support weight.
He said: "These sort of constructions are always very fragile and the iron railings can rust. The stone can become fragile and break up so you never really know how strong they are. It's something that engineers are very aware of.
"The ironwork is incredibly heavy Nike Air Max 2016 Womens so if it falls off it can be a disaster."
A local resident, who did not want to be named, told the BBC that furniture and pianos "go in and out of the windows all the time" on the square.
Estate agent Clem Byron Evans said: "In head leases it tends to say that you are not allowed to move furniture through the ground floor."
He said the ruling was due to the ground floor area in similar properties being communal and residents would be liable for any damage.
Cadogan Square consists of residential properties, with many of the buildings divided into flats.
The first floor balcony is believed to have been connected to property number 37, a five storey terraced building.
The decorative wrought iron railing appears to have fallen about 3.6m (12ft) to the ground, although the stone base of the balcony looks undamaged.
A number of long ropes were left hanging from the balcony to the ground where plastic sheets are gathered.
A police tent was erected on the pavement below and the street has been closed to the public.
BBC presenter Andrew Neil, who is Nike Air Max Womens Nike Air Max 2016 a local resident, described the area saying: "You'd never know you're in central London. There's never any traffic. It's so tranquil. A lot of people buy here to invest."