The new building will be on the same scale as the huge structure of iron and glass designed by Joseph Paxton for the 1851 Great Exhibition in Hyde Park. It was the largest glass structure in the world before it was destroyed by fire in 1936.
It was later relocated to south-east London to the area which became known as Crystal Palace.
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Officers were given the touching letter at Brixton Station while they were on a reassurance patrol after yesterday's attack
The 52-year-old had previous convictions for violence but was not on the anti-terror watchlist.
In a statement Charlton Athletic said: Keith was a true hero who will be greatly missed by all the Charlton family and everyone at the club.