The hikes are occurring in some boroughs that have signed up to the capital's Childcare Affordability Programme (CAP).
Denise Burke, head of childcare at the London Development Agency, said there was anecdotal evidence that some community nurseries and private and voluntary providers housed in local authority buildings had been faced with rent increases.
She said the LDA was planning to investigate further to see how widespread the problem is.
Ms Burke said there was a conflict within local authorities with 'asset management departments trying to bring in more money, and children's services departments trying to manage the childcare market'.
She added, 'For many community nurseries, their fee structure was based on peppercorn rent. There is a pull in local authorities - one area is trying to manage the purse strings and increase rent, and this is having a devastating effect on the childcare market.'
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