The Royal Free Charity has said it is looking into a new site for the plaque in honour of a historic Hampstead resident who helped revolutionise the postal system.
The memorial to Kidderminster-born Sir Rowland Hill was previously fixed to a wall on the Royal Free car park opposite Hampstead Hill School.
The car park has now been torn down to make way for the Pears Building, which is currently being built.
However campaigners had raised concerns about what had happened to the plaque, and whether it would be kept as part of the new building.
Sir Rowland invented the Penny Post stamp, which helped pave the way for the postal service we have today.
A spokeswoman said: “The plaque to Sir Rowland Hill was embedded into the brickwork of the car park and has safely been removed.
“We are currently establishing the best way to fix the plaque to the external fabric of the new Pears Building.
“This will allow us to preserve the legacy of Sir Rowland Hill, pioneer of affordable postal communication.”
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