A huge fire tore through the riverside offices of a Chiswick talent agency representing the stars including Ant & Dec and Tom Daley.
More than 70 firefighters spent several hours tackling the blaze at Pier House beside the Thames in Strand-On-The-Green, which broke out at around midnight on Sunday, January 17.
The office block near Kew Bridge was empty at the time but a dozen people from nearby homes were evacuated as a precaution.
The building is home to James Grant Group, which has a host of famous clients from the TV, music, sports and literary worlds.
London Fire Brigade said it was called to the blaze at 12.18am and the fire was under control by 4.30am.
It said London Ambulance Service had treated one man at the scene for a non fire related illness.
Station manager Carl St Paul, who was at the scene, said: "Our crews worked extremely hard in challenging conditions to get this fire under control and to stop it from spreading to neighbouring properties.
"Thankfully no-one was inside the office building when the fire broke out but around 12 people from homes close by were evacuated during the incident as a precaution."
In a statement on its website, James Grant Group, which also has offices in central London, Manchester and the US, thanked firefighters for doing an "outstanding job", and said it was working hard to be "fully functional" as soon as possible.
"We have made real progress already and are confident we will be up and running in the very near future in terms of all client services," the message read.
"We have received lots of messages of support and help already which we have all really appreciated."
The first floor and roof of the building were badly damaged, according to the LFB, which said firefighters would remain at the scene for some time on Sunday morning damping down the fire.
A total of 10 fire engines were needed to tackle the blaze, with crews from Acton, Chiswick, Richmond, Heston, Ealing, Kingston, Kensington, Southall and Hammersmith fire stations attending.
An aerial ladder platform and turntable ladder were also used to fight the flames from above.
The cause of the fire is under investigation.