Assembly Member and Richmond council leader Gareth Roberts says Sir Sadiq Khan knew about the possibility as early as last December.
Londoners found out in July when the Met announced almost half of police station front counters will shut in a bid to save money.
A spokesperson for the Mayor of London has addressed the claim but not denied Sir Sadiq knew about the closures.
The statement reads: “Nothing is more important to the Mayor than keeping Londoners safe and he is determined to continue doing all he can to support Sir Mark Rowley deliver a New Met for London, putting neighbourhood policing at the heart of communities.
“The proposed changes to police counters are an operational decision for the Met – based on resources, funding and public demand for services.
“After over a decade of cuts worth over a billion under the previous government, the Met is facing an extremely difficult financial situation. The Mayor is working closely with the Met to boost visible neighbourhood policing in our communities and is having ongoing discussions with Ministers and the Commissioner about the funding the Met needs to ensure we can continue building a safer London for everyone.”
