According to a study from Your Move,the capital was one of only two regions to see falling rents, the other being the north east, where rents fell two per cent.
Andrew Montlake, director at Coreco, said he was surprised by Your Move's statistics that London rents had fallen.
He said: "We have a lot of landlords who have very high standards of property and really look after them. Their real issue is the quality of the tenant they can get, and the rents they achieve are relatively high."
Jorden Abbs, director of operations at specialist buy-to-let mortgage broker Commercial Trust Limited, said: "It comes as no surprise that rents have risen across the UK.
"Government tax measures impacting buy to let investments have added significant costs to landlords. It was only a matter of time before tenants would see this hit the rent bill.
"Ultimately renting property is a business, and no sustainable business can absorb significantly heightened costs and maintain a profit without adjusting income.
"The uncertainty of Brexit is very likely to be causing an opposing swing in rents in London, however, all things are relative and London rents remain the highest in the country."
