They have also revealed that the building's insulation and cladding have failed safety tests.
Documents have been seized, police said, but they have not carried out any raids of businesses.
"We are looking at every health and safety and fire safety offences and we are reviewing every company at the moment involved in the building of Grenfell Tower", she said.
In Scotland, cladding put on buildings since 2005 - or added to them since then - is required to be made of fire-proof material.
In total across the United Kingdom, 11 residential high-rise buildings in eight local authority areas, including Mount Wise, have been found to be covered in combustible cladding.
"The numbers we have of presumed dead, confirmed dead or missing still remains at 79", McCormack said.
To make sure everyone comes forward, London Mayor Sadiq Khan pledged to seek an amnesty for people who may have been living in the public housing block illegally.
The council's general manager of building control, Ian McCormick, said body corporates would be advised "as soon as practically possible". "I remain really concerned that we do not have a complete picture". "I do not want there to be any hidden victims of this tragedy", McCormack said.
The investigation is one of the most complex ever undertaken by the Metropolitan Police, McCormack said.
The Hotpoint FF175BP fridge-freezer model that started the blaze at Grenfell Tower.
Trump says he did not wiretap conversations with Comey
Whatever its intention, the tweet ultimately led to the appointment of a special counsel that has taken over the investigation. The US President also said via Twitter on Thursday that he does not have any of the recordings previously mentioned.
Business Minister Margot James wrote to trade associations representing all major household appliance manufacturers last week outlining the government's expectation of action by their members should a household appliance be found to have played a part in the Grenfell Tower fire.
The Auckland Council will not name two high-rise buildings that have been found to have a combustible type of aluminium composite panel.
Windhoek-Speaker of the National Assembly Professor Peter Katjavivi has sent a message of condolence to the families of the victims who lost their lives in the fire that destroyed Grenfell Tower in London on June 14, which claimed 79 lives.
"DCLG have spoken to local authorities about private sector residential blocks".
"However, I do expect the number to change", she told The Washington Post. It is obviously easier for local authorities to check out buildings that they own.
The government has also promised medical and financial aid to those affected, as well as committing to rehousing them within three weeks.
"We will probably have to ascertain later today if that is happening what the next steps might be", she said.
Council leader Nicholas Paget-Brown, who is facing calls to quit, said he had accepted the resignation "with great regret".
She said that the Metropolitan Police will consider manslaughter charges as a result of the failed tests.
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